Stretch the screen size in-game?

I'm wondering will there be a way to stretch the screen size in-game? Say if I'm playing a game thats 800x600 in windowed mode and i can stretch it 2x or 4x the size.
Game Editor discussion board
http://game-editor.com/forum/
bat78 wrote:You can use BitFox's scale and render.
Turon wrote:I have one little question... How does the scaler in bitfox compare to lcl's resolutionary: viewtopic.php?f=6&t=10570? remember I'm comparing systems and code not members and people.