Gaming In A Separate Window...

I remember seeing a post about this a while ago (before i got my mac) but i cant seem to find it again, i would like to know how to play a game in a window, rather than having to play it full screen (like on the OS X Leopard Video on apple's website)

Each game may be different. In Diablo II for example, it's Command M.

Does Cmd+M work?

I know with The Sims 2 I can press Cmd as it launches and chose whether I want it in window mode or not.

nah doesn't work, im on Spores creature creator atm, not sure if its possible

somone must know because i think i did it by accident the other day so im sure its possible