Connection Problems

Well, I'm actually quite new to networking and the like. I've had some experience before, but it was all failed attempts.

You can skip the following paragraph....
Today I received a new laptop with Vista Home Premium. I managed to connect to my home internet network, and eventually share files and folders over a work group seamlessly (older tower PC has HDD with all of my media files, and it's easier and faster to just share them over the network than to copy them and take up disk space).

Anyway, I've installed Multiplicity (basic, trial, whatever you want to call it) on both computers. I had some troubles connecting (open ports and firewalls), but that is now out of the way. But, now, whenever I double click the computer to tell it to connect, I get a brief status bar, which flashes away instantly. I assume connection was a success.

But, still, whenever I move my mouse to any edge of the screen, nothing happens. I've tried reversing the process (changing primary to secondary and so forth) with no luck.

Any help from you would be greatly appreciated.