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I would recommend to use Subversion.

You're missing the point of the question. Pair programming involves both partners working on the code, watching as it's written, and one making live suggestions to the other as it's done. VNC would be a more appropriate solution to the problem, or if you're willing to drop the 'free' requirement, I've heard good stuff about this system, which at $100 per user isn't exactly break-the-bank kind of stuff.

Well, I guess that depends on who you bank with.

If the OP is a professor at a university looking for something that will allow real-time collaboration on a source code editor (syntax highlighting, build tools), I have only heard of one solution: UNA IDE. The software is proprietary and made by n-brain. http://www.n-brain.net/ I would suggest the OP contact the company and discuss educational license options. It is likely they would negotiate some reasonable pricing for class usage. I would highly recommend that the students also use a VOIP tool during coding sessions.

Given their UNA product. Does anyone else notice their advertising slogan? "N minds are better than N-1" Why do they call it N-Brain then...?

Getting this message for all platform downloads at http://www.n-brain.net/updates.htm

0: Connection failed to the host localhost.

Any mirrors available?

cheers,
file_reaper

Entirely? There's the stupid animations on the overview and the comparison table that isn't a table that I saw. I've just checked some other pages and the Practices page is also Flash for no particular reason. The header looks like a terrible Flash header as well, even if it is JavaScript.

I will admit that they seem to have at least been semantic with their code, though.

As for the IDE, I gave the video a quick watch (using the 'no frills' version that had frills like page turn effects for no real reason) and nothing stood out. In fact things like "be constantly pestered by conversations within your IDE, not another window that you can hide" seem like a big negative.

Give me Visual Studio .Net, Eclipse or MonoDevelop any day over that thing!

Entirely? There's the stupid animations on the overview and the comparison table that isn't a table that I saw. I've just checked some other pages and the Practices page is also Flash for no particular reason. The header looks like a terrible Flash header as well, even if it is JavaScript.

I will admit that they seem to have at least been semantic with their code, though.

As for the IDE, I gave the video a quick watch (using the 'no frills' version that had frills like page turn effects for no real reason) and nothing stood out. In fact things like "be constantly pestered by conversations within your IDE, not another window that you can hide" seem like a big negative.

Give me Visual Studio .Net, Eclipse or MonoDevelop any day over that thing!

Entirely? There's the stupid animations on the overview and the comparison table that isn't a table that I saw. I've just checked some other pages and the Practices page is also Flash for no particular reason. The header looks like a terrible Flash header as well, even if it is JavaScript.

I will admit that they seem to have at least been semantic with their code, though.

As for the IDE, I gave the video a quick watch (using the 'no frills' version that had frills like page turn effects for no real reason) and nothing stood out. In fact things like "be constantly pestered by conversations within your IDE, not another window that you can hide" seem like a big negative.

Give me Visual Studio .Net, Eclipse or MonoDevelop any day over that thing!

Also they seem to be forcing *remote* collaboration through their own collaboration product called "UNA". If they want to make it a real contest, they should force a contest between multiple people collaborating in the same room with one of them sitting in front of the keyboard with Microsoft Notepad, versus the same number of people collaborating remotely through this thing called "UNA".

"One Microsoft Notepad vs. Multiple Commercial Copies of UNA", that would be a cool contest to do, and I'm not a Microsoft Notepad fan boy (in fact, I hate the thing), but I would expect Notepad to win hands down in that contest.

And every year, I would redo the contest, but I would add one more handicap to the team in the same room using notepad. I'd tie their hands together, so they would be forced to type with their little pinky finger. I would make their room airtight and I'd cut off the oxygen going into their room. And if the Notepad team does survive my challenge, and win again of course, I'd call my methodology the pinky finger no-oxygen method, so I could slap a patent on it, and compete directly against "UNA".

Rules
# For both the Dragon and the Hydra challenges, developers must collaborate on a single solution. In the Dragon challenge, the developers collaborate through email and the shared version control repository. In the Hydra challenge, developers collaborate in real-time using UNA itself.

Why am I not surprised that both Tour examples are based on Java ?

It has been solved. The code.png image is indeed a sequential file. Counting sequences of one color separated by other colors reveals a numbering scheme between the red dots which, when applied to the rest of the file, yields indexes into the decimal representation of PI (the description shows familiar substrings at offsets 0, 1 and 2.) Taking 6 digits each from the listed positions gets you two 3-digit ASCII codes which form the description of a stack machine that decodes the messages on pages 2/3 and 3/3. The 2/3 message is "cerebrum, vere-tempus, together (adv.)". Turn Latin into English and English into Latin and you get "brain, real-time, simul (una)". Googling reveals that a company called N-BRAIN will release a collaborative software development package called UNA on 2008-01-18. An encoding of "UNAreleasedate" for the stack machine is "eRnnnueNueAueRleIaue-leNaueRleBanue-leNaue-leIanueBleRaue-leNaueBleBanue-leIanueBleRanue-leNau", which transports you from page 3/3 to the congratulations. They'll send you a standalone version of UNA if you provide them with your email address and the email addresses of your collaborators. You can also check a box to request an interview. A cookie contains the code you entered in step 1/3. They say they'll look at the order of the entrants and the code to determine who gets an interview.

N-BRAIN is a privately held company in Boulder, Colorado. You can apply for a job without going through the puzzle. According to http://www.n-brain.net/jobs.htm they don't look at resumes but give you an assignment to evaluate your code-fu. The team page lists four people, including the founder John A. De Goes, who is the author of two books on game programming ("3D Game Programming with C++" and "3D Game Programming with C++ Gold Edition"), worked as an instructor at http://www.gameinstitute.com/ and is a member of the Boulder martial arts and agile software meetup groups.

The true confirmed answer is the release date of a software program called UNA by N-Brain. http://www.n-brain.net/index.htm