Since Quake 4 is a mid-2000s title, almost any modern laptop can handle it at max settings. Even on a budget USB stick, it should run "smooth as butter" if your machine meets these basic hurdles: Quake 4 No Disc - Quake3World
A CD key, also known as a product key or activation key, is a unique code required to activate and play the game. quake 4 cd key portable