Yup- I have PT installed on my PC lappy and the video workstation G$. Just for kicks, really. The 3rd party plugs, though, generally require either challenge and response authentication (which wont work well on 2 computers) of the iLok. I was reading about the iLok and it, apparently, lets you move your plugs from computer to computer with the key... but only for Mac at the moment. Gotta love software piracy- makes it so that people who pay for the software can't use it.
Take care, Chris