Grey2ham
Chieftain
I am not sure, if you are the correct person to ask 2K Elizabeth, but can I play with a Family member over the same Internet Connection but with different Steam Accounts (we would both buy the Civ5) in the same Game? Don't know much about steam. Maybe some other could answer this question?
Im no expert, but:
Both myself and my brother have played steam games on seperate computers with seperate steam accounts within the same household for years with no trouble. Provided the computers will have seperate IPs it shouldn't be a problem. Someone more technically gifted could probably answer this better though.
You couldn't, however, use the same account on two PCs simultaneously. That would be breaking the terms of the licence and steam forces a log off from the previously logged on PC. Remember to disable steam's auto-start or auto-log on if you install it on your girlfriend's/wife's/husband's/boyfriend's/partner's/friends's/dog's laptop when your computer isn't working or you can be booted out.