Depends if you're playing Halo 1(Combat Evolved) or Halo 2.
1:
Left CTRL
2:
Don't know because I've never played 2 on the PC, sorry
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No. Halo is for PC and XBox.
No.
a good pc game is halo
No. The Halo chain of video games is only on Xbox and PC.
You have to get Halo CE for the PC, and run the game in Dev mode.