Except of using the content room Poser 5 is not trying to connect to the internet. As already mentioned it sends and listens to broadcasts on the local net looking for a copy with the same serial number. If you block Poser in esp. ZoneAlarm it slows down a lot! I did so once and everything (starting/loading/rendering) was a lot slower, maybe because it consumes so much CPU time trying to connect anyway. So IMHO it's a bad advice to block Poser.