Thanks, Kate. Joking aside, I was starting to get scared - I've just put my copy of Poser on my other (networked) machine. I know that you're not supposed to do this with any software, but I reckoned 'what the heck, it's not doing any harm or depriving CL of revenue or anything.' This thread started to make me think that I'd done something that would get my serial number blacklisted or something. I had some vague idea that when one machine was working on a reallllllllly slow render I could go and do something else on the other - It looks like I'll have to drop that idea and go back to coffee and a book during long renders (s) What happens if it DOES find another copy? Does the second refuse to boot, or something? (I'd experiment, but I'm afraid in case both copies implode, or in case my PCs explode and burn down my house or something (s) Thanks! John