Right click the Halo shortcut on your desktop, and go to properties. On the shortcut tab, add "-screenshot" without quotes to the end of the "Target" box. Remember to put a space before the dash. Click OK, and then run Halo using that shortcut. Once Halo is up and running, you can press the Print Screen key on your keyboard at any time to take a screenshot. The file will be placed in your "C:\Program Files\Microsoft Games\Halo\screenshots\" folder in TGA format. You can use QuickTime to open it.IMPORTANT NOTE: Once you exit Halo and open it again, any previous screenshots will be overwritten, so you have to copy any pics you want to keep to another folder.