software

KDE Follies

I’ve been busy. And I’ve had headaches. This is mostly why you haven’t heard from me in a few days. I wondered for awhile if I was getting headaches because I was busy, but I’m coming around to a different point of view: I’m having headaches because I’ve been fooling with KDE.

I used to like KDE, until KDE 4 happened. Kubuntu 8.04 would not install correctly on two of the three machines I tried it on, and on the third it malfunctioned weirdly after a couple of days of very light use. I had almost no trouble with Kubuntu 7.10, apart from its failing to set up a network printer. That was KDE 3.5, which I liked. The press on KDE 4 was not good, and I figured I would let Kubuntu rest for a couple of cycles to see if the KDE 4 codebase would shake out a little.

I might have waited for 9.04 except that I couldn’t get the KDbg documentation to run under GNOME. I like KDbg a lot; it’s a beginner-friendly front end to the highly human-hostile gdb debugger engine. I’d like to cite it in my book, but there are a couple of things about it that I just can’t figure. Press F1, right? Well, when I do that, I get a mysterious error dialog:

Could not launch the KDE Help Center:

Could not find service ‘khelpcenter’.

I assumed at first that this is what happens when you have a KDE app running under GNOME, but the kate editor is also a KDE app, and its help document comes up without any trouble. The khelpcenter4 package is installed on the system. The obvious thing to try is to run KDbg under KDE, and see if things work any better.

Of course, to do that you have to have a running install of KDE.

I downloaded the latest Kubuntu ISO (in 13 minutes on BT!!), burned it to CD, and booted the live install on my SX270, the same machine on which Ubuntu 8.10 installed without a glitch. Kubuntu detected the monitor resolution, but…the display blacks out every six seconds for about three-fourths of a second. Otherwise (heh) it runs perfectly. The blackout is not a fade; the screen just turns black instantly. It made me a little nuts, but I suffered through this game of desktop peek-a-boo long enough to install KDbg. I pressed F1. Same dialog. KDE can’t seem to make its own help system work.

So KDE is on that certain list of mine right now. Even though it displays the assembly source for single-stepping, KDbg won’t display named initialized data in NASM executables, and the Memory window refuses to display anything, initialized or otherwise. Being able to inspect data in memory is mighty damned useful, and I’m starting to think that KDbg isn’t really set up to debug assembly language. Like almost everything else in the Linux world, it’s a C thing. Maybe there’s a magic command-line option that allows it to interpret stabs format debug data for assembly language, but there’s nothing much about it online. Clues welcome.

And Kate? The only thing it lacks is a shortcut for running make or launching a debugger, but that’s easy enough to do in the terminal window. It’s graspable enough for beginners, and that’s what I’m striving for here. Newcomers should not have to learn EMACS or gdb to make “Hello world” happen in assembly.

I don’t want to have to use gdb Insight (if there’s an uglier widget set than Lesstif’s I’ve yet to see it) but if I can’t get KDbg to browse data in memory, I may have to. And the decision has to be made soon. (I feel another headache coming on…)

Odd Lots

Feb 7th, 2009

by Jeff Duntemann.

2 comments

German model train manufacturer Marklin has filed for bankruptcy, though there is still some hope that the 150-year-old firm will remain in business. Thanks to Pete Albrecht for the link.
Scientific American has an interesting retrospective on the infamous nuclear-powered B-36 that actually flew back in the late 1950s, with a live, air-cooled fission reactor in its rear bomb bay. I’m less twitchy about nuclear than almost anyone I know, and that item still gives me pause. (I do think that the stock B-36 was the coolest military aircraft of the transition period between props and jets, and one of the coolest of all time, period.)
From Rich Rostrom comes an aerial photo of the Fovant Badges, which are a group of military insignia cut into the Wiltshire chalk downs in southern England. They date back to WWI, and have been laboriously maintained since then–a job and a half, considering that some are over 200 feet wide.
When I first heard Cher’s uber-irritating hit “Believe” years ago I wanted to know what sort of processing was going on with her audio. I didn’t want to know enough to search too deeply, but it recently turned up on Slashdot. The gadget is called Auto-Tune. And Cher can actually sing when she wants to; one wonders what it could do for no-voicers like Bob Dylan.
I’ve never paid much attention to KDE’s Kate editor, but discovered today to my delight that it has syntax highlighting for NASM. I’d basically given up trying to find a lightweight Linux assembly language IDE to describe in my book, but half an hour of lightweight fooling around with it makes me think that Kate might be the one. Now all I have to do is become an expert in the next couple of weeks. Are there any books on it, print or e? I looked around and have found nothing so far.
From the Words I Didn’t Know Until Yesterday Department: interpunct, which is a small dot used originally in Latin to unambiguously mark the spaces between words. It’s still used today to show you where the invisible characters are on your screen, and I recognized the concept immediately, but never knew what it was called.
From ditto: A placket is a flap of cloth that hides a button on fancy clothes. I have a pair of pants with one, and again, never knew what it was called until very recently.
Pete Albrecht pointed out a source of very nice cast aluminum house numbers in the Craftsman style–though at prices like these, I’m glad I have only a 3-digit address.
From the Painting the Devil on the Wall Department: One of the nation’s leading promotors of monster truck shows was run over and killed by a monster truck at one of his own shows. (Again, thanks to Pete for the link.)
From Ed Keefe comes a pointer to a stunt kite fitted out with a microcontroller, an accelerometer, and LEDs so that it could be flown at night and turn different colors depending on how fast it’s going and which way it’s pointing. I flew a kite at night in 1965 and only knew what it was doing by the crackle noise it made and how hard it pulled on the string. Technology advances…

The Yard’s All Out of 3 X 4s…

Feb 6th, 2009

by Jeff Duntemann.

2 comments

I’ve gotten far enough into the revision of Assembly language Step By Step that I need to have a Linux machine running up here in my office all the time. I often spend hours in Ubuntu on this dual-boot machine, but there are still some things I need to do in Windows, and booting in and out to bounce from one to the other is time wasted, and pointless when I have old PCs stacked like cordwood in the basement.

I have one of the very cool SX270 stainless-steel all-in-one brackets that combines a 10cm VESA monitor mount with a couple of tangs to hold an SX270 mini-PC behind the monitor. It makes for a very compact system, and in fact it was the integration of the SX270 and the monitor on the bracket that first brought the SX270 to my attention some years back, when I saw a couple of them at our optometrist’s office. So I took my spare SX270, parked it on the bracket, dug a Dell keyboard and a mouse out of the odd lots box, and realized that I did not have a VESA monitor to hang on it. So off we went to Best Buy, where I learned from the earnest young woman in the computer department that they had not sold 4:3 monitors for almost a year now. Every single one in the long line on display was 16:9.

I know why this is the case (home theater) and whereas it wouldn’t be my first choice, I’m willing to use that form factor, and really needed a monitor. I was apprehensive for a simple reason: The SX270 was made in 2003, and I don’t recall the machine supporting the 1600 X 900 resolution of the smaller 16:9 LCDs. I took a chance, figuring (or at least hoping) that I could rummage around online and come up with a newer driver for the Intel 82865G graphics chipset.

What I bought was a Samsung SyncMaster 2033SW. It’s VESA-compliant, and I bolted it to the stainless steel bracket without difficulty. It was on sale for $179. The machine itself cost me less than that; I think $150 on eBay some time last summer. 2.8 GHz, 1 GB RAM, with XP Pro–used and used hard, and ugly up close, but completely functional. I went up to Dell’s site to see if newer video drivers were available, but what they had was what I had. The closest that Windows could come to 1600 X 900 was 1280 X 768. The monitor centered the smaller raster in the middle of its screen, with the surrounding pixels dark. There was a “stretch” option that spread the raster out to the full extent of the screen, but it looked hideous.

Fortunately, Windows wasn’t the goal here. I booted the Ubuntu Intrepid installer CD in LiveCD mode to see what the OS would detect and how it would respond, considering that the machine dates back to 2003. Without a grunt of complaint, it detected the graphics hardware and loaded a 1600 X 900 driver. I tried a few things, pronounced it good, and told the OS to go install itself in earnest. Twenty minutes later, I was downloading NASM, Kdbg, the Bless Hex Editor, Nemiver, ddd, and a few other things through the Synaptic Package Manager. Not once did I have to face a command line. Everything Just Worked. The age of the machine (apparent from its collection of dents and inventory-tag stickum) didn’t seem to matter at all.

The display is gorgeous; it’s easily the brightest LCD I’ve ever seen. The whole gadget takes up about as little space as anything with a 20″ monitor possibly could. And after spending an afternoon with it, I realize that a long horizontal aspect can be handy: Editor on the right, Kdbg on the left, and just enough of a terminal peeking out under the editor to run make as needed.

I’ve been fooling with Linux intermittently for well over ten years, and the craziness of today’s events still boggles me: It installed much faster and way more easily than Windows generally does, and on old hardware to boot. This was not the case in 1999, let me tell you. If MS isn’t in trouble by now, it’s nobody’s fault but our own.

Odd Lots

Jan 23rd, 2009

by Jeff Duntemann.

No comments yet

From the Words I Didn’t Know Until Yesterday Department: The Ranters were a wild-eyed seventeenth-century religious fringe group, who were perhaps most notable for incorporating nudity into their worship. (Whatever else they might have been, they sure weren’t Catholic.)
From ditto: In modern urban slang, a “butterface” is a homely girl with a great body, as in, “Every part of her was perfect but her face.”
And elsewhere on the words front, even William Safire, from whom the scariest words recoil in terror, was unable to determine the origin of that very up-to-date and with-it 90s expression, “it is what it is.” Wikipedia suggests that it was coined by John Locke, circa 1680. So much for being up-to-date.
From the Microprocessors I Never Heard of Until Yesterday Department: There was an 80376. It was an embedded variant of the 80386 that did not support real mode, but only protected mode, and was produced from 1989 until 1994.
Much angst is flowing about the blogosphere concerning the Conficker worm, but this is the first page about it that I respect at all. I’ve long since disabled Autorun, and in fact, “autorunning” things is one of the worst ideas in computing since DLLs. Make sure you’ve got that November patch they speak of
And while we’re talking worms, here’s some news on a piece of malware that comes in on pirated Mac software, evidently with the intent of creating an all-Mac botnet. The dangerous thing here is that a lot of nontechnical people seem to believe that the Mac is immune to malware somehow. OS/X is certainly tougher to infect than Windows, but it can be done, especially when people are sure that it can’t.
Carol and I launch our Internet-facing apps under a clever mini-utility called DropMyRights, which basically runs such apps with limited user account privileges instead of admin privileges, even if you’re running as admin. Doesn’t work on Win2K, so I have not used it myself until fairly recently, but I installed it on Carol’s XP box probably two years ago, and she has used it daily without any issues since then.
I have tried and failed to make a Linux utility called KGrubeditor work under my instance of Ubuntu Intrepid. When I attempt to launch it, an item appears in the taskbar for about fifteen seconds before vanishing, and nothing else happens. At least one another person I know has made it work correctly, but I just don’t see what I’m doing wrong. I installed it through Ubuntu’s apt-get shell and saw no errors during the process. If any of you are users and are aware of any trickiness in the utility, I’d love to hear more.

An Embarrassment of Riches

Jan 22nd, 2009

by Jeff Duntemann.

2 comments

I’m hard at the rewrite of my assembly book, and in going over the chapters closely I realize that I have a lot to do, significantly more than I thought going in. Parts of this book date back to 1988, and the work as a whole was not organized back then the way I would organize it today. So I’m doing more to it than I thought I would, and although that will make for a better book, it’s also eating more of my time. (Expect a few fewer Contra posts over coming months, and perhaps shorter ones.)

I’ve also been using Ubuntu a lot more than I ordinarily do, since the rewrite finally exiles DOS from the discussion except as a historical footnote. I find myself surfacing for a breath now and then, and realizing, I haven’t been in Windows for almost six hours! Crossover Linux has made this possible, since I have Office 2000 and Visio 2000 installed under Ubuntu now, and don’t have to be bouncing between two machines or two partitions to write code and then write about the code.

In the process, I’ve been using Ubuntu more and at more depth than I ever have before. One thing I’m beginning to appreciate is just how easy it is to get software and keep it current, and just how good the software that’s out there really is. That’s changed in ten years. Back in 1999, in order to run NASM under Red Hat I had to download a tar file full of source, unzip it somewhere, and then recompile the whole damned thing. I had no intention of changing the assembler and would have been more than happy with binaries.

It’s different now. With Ubuntu (and I assume most modern distros) you go up to a software repository through a package manager utility, cruise an enormous list of free packages that are available, and check off the stuff you want. Then you click Apply and stand back: The package manager downloads the package and anything that the package depends on, checking first to see if you’ve got any of the prerequisites installed already. Only the stuff you need comes down, and when the smoke clears you have new apps on your app menu, or new libraries tucked in where they’re supposed to go. (Or both.) Wow.

Ubuntu periodically checks to see if updates are available for anything you have installed, and a couple of clicks brings them down and installs them.

I’m sure that not everything that exists is up there, but what’s up there is extremely impressive. If I allowed myself to get distracted, I’d be playing with Gambas and Boa Constructor rather than writing. The Nemiver debugger front end didn’t exist ten years ago, and it will star in the new edition of Assembly Language Step By Step. Most of all, I want to play with Lazarus (the GUI IDE for Free Pascal) and have to slap my hands periodically, or I’d get nothing else done.

The primary barrier to the adoption of the Linux Desktop is unlearning old habits, followed as a distant second by conversion of existing Windows-centric files. There may have been a third barrier somewhere, but I’ve forgotten what it was. There is certainly no shortage of software to get the jobs done.

Michael Arrington’s Crunchpad Gets Real

Jan 19th, 2009

by Jeff Duntemann.

1 comment

I read about Michael Arrington’s concept for a low-cost Web tablet back last summer, and was intrigued. Web is useful, but the resolution on this gadget (1024 X 768) would make it ideal for reading PDF ebooks, particularly textbooks and scientific/technical nonfiction with lots of illustrations. Not every type of book can be read on a cellphone, and the sorts of ebooks that require larger displays are getting precious little respect in the gadget world.

But I learned today that the Crunchpad (as the TechCrunch crowd is now informally calling it) has reached the prototype stage. They sound like they’re aimed in the right direction, but remarkably, I see no discussion at all of the device’s usefulness as an ebook reader. (I added a comment to the entry to this effect.) It looks like it can work in portrait mode, and has an accelerometer to sense when it’s been “spun.” Ebook reader utilities are not cycle-hogs, and would add little to the burden on the CPU or SSD storage.

I’m a little queasy about on-screen touch keyboards; I would use the USB port for a “real” keyboard when one is needed. I would also add an externally-accessible SDHC card slot for loading content without waiting for the inevitably slow Wi-Fi link. But beyond that, if the thing can render PDF and CHM ebooks well, I’d buy one like a shot, and pay $300 for it without regret. This is one to keep an eye on.

Remote Lecturing with Skype and Mikogo

Jan 10th, 2009

by Jeff Duntemann.

3 comments

First on my do-it list this morning was to deliver a lecture at Miami University at Middletown, Ohio. I’m still here in Colorado (though, alas, Carol is in Chicago again and I’m batching it until the 26th) but it worked out well, and the lecture was my first “production” use of Skype and the Mikogo plug-in for Skype for remote presentation.

Jay Slough K4ZLE of the Southwest Ohio Digital and Technical Symposium asked me to do an hour-long presentation on Carl & Jerry well over a year ago, but our schedules didn’t mesh in January 2008, and we had to wait a year for another chance. In a way that was good, because in my view, Mikogo plows NetMeeting (which we had intended to use last year) right into the soil.

Mikogo adds presentation capability to any participant in a Skype conference call running the plug-in. Whatever is displayed on the screen of the chat participant deemed the presenter is echoed on all other participant screens. The presenter can change at any point, so people can take turns presenting to the group. Mikogo defaults to screen echo only, but it has an option for remote control, a la VNC. Mikogo also allows the presenter to draw nondestructively on the echoed screen, whiteboard-style, though I didn’t need this feature for today’s session.

I’m a seasoned lecturer and have done presentations to groups as large as a thousand people, but there was a critical difference this time: I couldn’t see the audience, and could hear them only faintly. The other end of the Skype/Mikogo connection was Jay’s laptop driving a big-screen VGA projector in a university classroom, with Jay at the controls wearing a headset. I sat here in my chair in front of the screen in my office, talking into my headset between Powerpoint slide changes and trying to remember not to wave my hands. I missed not being able to play off the audience, and couldn’t tell if they were laughing at my jokes. During the Q&A in the last five minutes, Jay had to relay all questions to me, which was awkward even if necessary.

Technologically it went well, though it took a couple of minutes longer than we planned to get the two systems talking to each other. During the presentation, Thunderbird popped up an email notifier box in the lower right corner of the screen, and until I could shoot the box it became part of the screen echo. The symposium gang out in Ohio apparently loved it, and it was a great opportunity to popularize Carl & Jerry to people I would probably never have connected with otherwise.

I’d do it again in a heartbeat, but I’d like to add some refinements, which I think Skype could support:

I want a cam aimed at the audience, with a mic that will pick up general sound from the same direction. Video from the cam would have to go on a second display, but displays are cheap. Audience feedback is important, whether you’re a stand-up geek comedian like me or not.
Less necessary, but it might help the general tenor of the presentation: Somehow display a borderless video window in the lower left corner of the presentation screen, so that the audience can see me. (I’d leave a hole in my slides sized to match the video window.) How well this would work is obscure but readily testable. My webcam is four years old and I probably should get a new one. Logitech sells high-res units that automatically integrate with Skype.

Other applications of this system suggest themselves: Real-time manuscript workshopping, with workshop participants taking turns echoing their screens while displaying their manuscripts. Tech support. And (as Pete Albrecht and I intend to try in the next few days) remote control of his big Meade telescope and imager.

Skype is a fine thing. Pete is in a Skype window right now, telling me about the new Skype competitor, Oovoo, which adds session recording to videoconferencing. Skype lacks that feature, and it would be handy for people (like me!) who couldn’t make it all the way to Ohio for the Symposium. More when (or if) I try it.

Odd Lots

Jan 6th, 2009

by Jeff Duntemann.

4 comments

Quick reminder: If I’m on your blogroll, or if you have a link to Contra on any of your pages, please check to see that the new URL is in place. Thanks!
Pete Albrecht sent me a link to a fantastic technical animation that “assembles” the Space Station one module at a time, while displaying a timeline on the right indicating when each part was orbited and attached. I knew roughly how the thing went together, but this is almost like Cliff Notes. Takes just a couple of minutes to watch. Don’t miss it!
Again from Pete is a site with more information on steam turbine locomotives. I had heard of the Jawn Henry (That’s how the Norfolk & Western spelled it) but had not seen a photo until I followed the link in the article. The main problem with coal-fired turbine electrics appears to have been coal dust in the electric motors. Makes sense, but I would never have thought of it.
Henry Law weighed in from the UK on the merits of Marmite, the original beer yeast leftovers toast spread, as far superior to those of Vegemite. (See my entry for January 4, 2009.) I may have to let Henry duke it out with Eric the Fruit Bat over this, as I have not tasted either but will try some as soon as I don’t have to buy a whole jar. Sam’l Bassett suggests that its flavor is heavy on the umami, which makes me a little nervous. I don’t taste MSG at all–flavor enhancer is not a word I’d use for it–but it makes me feel almighty strange, even in very small amounts.
The Boston Globe, of all things, published a piece stating strongly that cities are really, really really bad places to live from the standpoint of health and clear thinking. I learned that twenty years ago; nice to see that the mainstream media is giving the idea some air. Alas, their answer–more parks–is treating the symptoms, not the disease. The disease is overcrowding, and the answer is to revitalize small towns. But that’s just me, and what do I know about quality of life?
I had long known there are “large” Lego blocks called Duplo, but it wasn’t until Katie Beth got a set for this past Christmas that I had ever seen Mega Bloks, a sort of “house-brand” Lego and widely despised as a cheap imitation. However, even though Mega has both a Lego and a Duplo clone, they also have Maxi Bloks, which are larger than Duplo and so large, in fact, that no adult human being is likely to be able to swallow them, much less a two-year-old. This was a good idea. I want Katie to be comfortable with the idea of building things, and Maxi Bloks make it unnecessary to wait any longer.
The February Sky & Telescope has a very defensive editorial from Robert Naeye, countering a tidal wave of accusations that S&T has gone the way of Scientific American and has been “dumbed down” in terms of scientific content. I don’t have a link to the editorial online, but its core point is so silly I groaned. Naeye basically said that “We’re not getting dumber–you’re getting smarter!” Um…no. You’re getting dumber. I had been a subscriber for 25 years or so with just a few gaps. I think I have a sense for where it was when I came to it, versus where it is now.
I’m editing this with Zoundry Raven, as I have since I stumbled on it a couple of weeks ago. I’ve used Raven enough now so that I can recommend it without significant hesitation. The Zoundry business model is interesting (albeit difficult to describe) but it’s also optional–you don’t need to participate to use the software.
Hey. I didn’t get this for Christmas. Neither did you. But boy, the 12-year-old in me ached a little when I saw it…
I’m amazed that I never knew this, but the Anglican term for the Feast of the Holy Innocents (December 28) is “Childermas.” He doesn’t use the word, but arguably the best song James Taylor ever wrote is about the Three Kings, Herod, and the Holy Innocents. “Steer clear of royal welcomes / Avoid the big to-do. / A king who would slaughter the innocents / Will not cut a deal for you.” Indeed. Avoid all kings. Keep them in chains when you can–even the ones we believe that we elect.

Mission of Gravatar

Jan 2nd, 2009

by Jeff Duntemann.

8 comments

One thing I didn’t quite figure out with WordPress before New Year’s Day was how to upload a userpic for myself. It’s not a critical issue, and I kept bumping it to the back of the “look into this” list–until this morning, when I realized that a commenter had a userpic. This is not LiveJournal, where thousands of people have their accounts all on one server and userpics are stored centrally. This is my own private instance of WordPress, installed on my own hosting service, with no blogs on it but mine. So wherethehell did that userpic come from? Shortly thereafter, Julian Bucknall showed up in a comment, with his own userpic. At this point, I quit gnashing my teeth at Ubuntu for being atavistic (why isn’t there a dialog in the admin menu tree somewhere for setting a search path? Huh? Huh? Why?) and did some digging.

Of course, something interesting is going on here. There’s a Web service called Gravatar, which maintains small images (either photos or drawn art) intended to be used as personal avatars on blog comments and discussion forums. Each image is keyed by an MD5 hash of the image owner’s email address. Blog or forum software (anything, actually) simply makes a request to gravatar.com with the hash, and it gets back an 80X80 image.

This works great–when it works, which is most but not all of the time.

I’m still scratching my head here. I can see my gravatar image on Contra from every browser in the house except the instance of Firefox 2 here on my main machine. IE6 on this box shows it. FF2 and all IEs V6 and after show it. But FF2 on this box won’t–except in the “Recent Comments” pane of the dashboard. Then, sure. Gotta make it complicated.

This does not compute. It’s the same damned version of FF I have running everywhere in the house. (2.0.0.20) I’m not big on plug-ins, and there’s nothing peculiar about this install of XP. I do not see why viewing WordPress on this instance of FireFox would be any different from viewing WordPress with any other instance of Firefox–and it does see other people’s gravatars over their comments. Just not mine.

Still stumped, and I’m posting this to see if any of you do not see my picture in the avatar block of any of my comments here on WordPress. Suggestions, of course, are welcome. I won’t croak if I can’t see my own gravatar as long as everybody else can, but things like this give cloud computing a bad name.

One final note, which boggles this old mind: Gravatar has a rating system. You can have G, PG, R, and X-rated gravatars. You heard me: X-rated gravatars. In an 80-pixel by 80-pixel block. Damn. I can’t have a GUI dialog to set the Linux search path, and you can have an X-rated gravatar. Somebody’s getting ripped here. Deciding who I leave as an exercise for the reader.

Mikogo Over Skype

Dec 16th, 2008

by Jeff Duntemann.

2 comments

Yesterday I discovered Mikogo, a Net meeting/remote desktop technology that would be a lot like VNC and the others I’ve played with, except that it can be configured to piggyback on Skype. There is a Mikogo Skype “extra” (what Skype calls its plug-ins) and I will be using it to give a remote lecture on Carl & Jerry to the Southwest Ohio Digital and Technical Symposium on January 10, with the help of Jay Slough K4ZLE.

Jay and I gave it a spin yesterday to make sure we could connect during the Symposium in January, and in addition to working well, Mikogo was mighty cool. You install the extra from the Skype Extras menu, and it comes down the same way that other Skype extras do. Once installed, you can create a 1-to-1 or 1-to-many connection with anybody else who has the Mikogo Skype extra running. Skype handles the audio, and where the connection is between two machines, the “presenter” (the machine that provides a screen echo to the other) can be switched back and forth at any time. Mikogo has a simple whiteboard feature that allows the presenter to draw lines in various thicknesses, colors, and shapes on the screen. It also has the option of remote control, so that the non-presenter can use the mouse and keyboard on the presenter’s machine. Pete Albrecht and I plan to try using Mikogo over Skype to allow me to control Pete’s big Meade telescope from here in Colorado, at least when it stops raining in Orange County.

I don’t have a great deal of experience with the Mikogo system yet, but after an hour or so of solid connections with Jay and with Pete, I can say that it’s well worth trying if you have any use for that sort of thing.