How might you use such a tool? Here's an example: Not long ago I wanted to give Dave a guided tour of the analytics tool we use here on Business Hacks. We each downloaded and ran the tiny CrossLoop app. Then I gave Dave the code number generated by my app, which he keyed into his app. Presto! In seconds he was "sharing" my screen, able to see everything I was seeing.
I also had the option of giving Dave remote control of my system, which would be handy if he was, say, an IT guy helping me fix a problem.
As it happens, that's kind of CrossLoop's raison d'etre these days: It pairs tech-support guru types (i.e. "helpers") with people who need help with their PCs. (Not a bad little sideline business if you're looking for some extra income.)
Getting back to the Mac version, it offers cross-platform compatibility, meaning Windows users can share/control Mac desktops and vice-versa. That's perfect for businesses that run both operating systems.
Best of all, CrossLoop is free (though the company does take a cut if you become a helper, natch).