well that's about it with the explaining: one mouse for 2 pc's :-)
We've got the idea from a guy who played World of Warcraft with 5 characters at the same time. He didn't tell what specific Hardware he was using, but it was some dude who had a lot of money (as he said himself, dont' know if it's actually true :-) but considering you have to pay 5x an Account this could actually be true), so i'm guessing he had some fancy stuff. Our idea is something similar but we're just interested in the howto, less in the use-to. and for little money of course.
So basically the idea is that we got 1 mouse and 2 pc's. We want that we can use the one mouse on both pc's simultaniously. Meaning: Both Mousecursors are at the same position, at every time.
First we thought, we could use a wireless mouse with two receivers. But because we didn't have such mices (and we didn't want to buy those) we didn't try it. I think, that wouldn't have worked either.
So we decided to try it with an usb mouse. the idea was simpel. we cut the cable in half (okay not directly in half, but i think you get the idea), and soldered 2 new cables at each of the little ones (GND,9V,Data-in and Data-out). At each end, we put everything in 2 male thingies.