Title says it all. User needs Steam.
First come first serve.
It essentially gives you access to TF2 for 3 days.
Please don't ask for it if your computer can't run it, as it's a waste of a Guest Pass.
Minimum: 1.7 GHz Processor, 512MB RAM, DirectX® 8 level Graphics Card, Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection
Recommended: Pentium 4 processor (3.0GHz, or better), 1GB RAM, DirectX® 9 level Graphics Card, Windows® Vista/XP/2000, Mouse, Keyboard, Internet Connection