Question about Steam and multiple machines
I'm buying my wife a laptop for Christmas and I was wondering if its possible to share games purchased on Steam on multiple PCs but only running one at a time. So, let's say I'm playing some Team Fortress 2 over Steam on my PC and she wants to jump on her laptop and play Plants vs. Zombies on her laptop at the same time. Can we even do this? Is it even possible to authenticate two instances of Steam simultaneously?