Well, simply put, it creates extra desktops, and by clicking on the appropiate vwm square, it switches to that desktop. By opening up or restoring windows while on another desktop, you can keep windows organized by desk. Not sure if I can explain it better than that.

Perhaps you were looking / expecting it to do more...
I'd love to be able to do the taskbar thing, where it shows only the windows that are on the current desk, but to be honest, I don't know how.

If anyone does know how that works, please let me know, and I'd be glad to try and implement it.
Last but not least, the border showing up issue is one that i was planning on addressing before release, but, well, i kinda forgot.

It's easy to fix though, and since I've had some other feature requests from else where already, it will be part of the next release which should be soon.