The reason I have linked to Apple - Remote Desktop in the Extreme Learning (XL) thread is that I've been thinking of how the pair programming of XP might have a parallel in XL:

Apple Remote Desktop enables a teacher to keep an eye on all the computer screens in a classroom or lab, distribute software upgrades, perform group demos, and provide online assistance with real-time text communications for students needing individual attention.

It's difficult to tell from the specs whether students could also pair themselves up. It seem to be more a one-to-many, where the 'one' is the teacher or adminstrator. I'd like to see student-to-student capabilities too.