I don't have a key for it. I just have the free version. I think it's damn cool but I don't have windows xp, so I need something like this program to get my windows to do this kind of stuff. It doesn't seem to slow down my computer at all.
Here's the stats from windwos task manager.
Mem Usage 1,988K
Peak Mem Usage 7,916K
VM Size 1,496K
Paged Pool 19K
So, I mean... not much memory is used on this at all.