Running full screen programs in a window

Esscuse me,

I am wondering if it is possible to run programs made for full screens (e.g. quake, warcraft, etc) in a window some how? If it is please tell me :)

A lot of the time you can just press ALt-Enter. Not sure if it works with them though.

It depends on the game.

So theres nothing I can do to all games? :(

Unless it's ran in a dos prompt.

What game do you speak of?

Windowed performance is far less than full-screen.

Im talking about all sorts of full window games e.g. Empire Earth, Helbreath, Quake, Warcraft, Midtown Madness.

why not jsut Alt-Tab out?

Because then I cant use it and other programs at the same time.