Collabware

Basically just remote desktop limited to one program. There would be a system similar to online game matchmaking to connect users with one another easily.

I can think of two ways that this could be implemented - either have the applications themselves have matchmaking systems, or have it be a general connection program wherein you would find a peer and then select a program that you both have.

It would be especially useful in creative applications like Photoshop or FLStudio (music synth/sequencer program) as you could have direct collaboration remotely.

There would also have support for more than two users at a time which could be a huge help for offices.