On the first demo version, you could have hit the [TAB] key to open the console. The second demo version and the full version console command is the [F2] key.
Hit F2 key to open console, then type the following codes and ENTER to activate them.
ghost
No Clip Mode (Walk through walls)
walk
Return to normal game play if you used either "fly" or "ghost" cheat.
playersonly
Freeze Ememies
killpawns
No Ememies
Skip levels
Press F2 to bring up the console during game play and type "mission win". This will instantly complete the current mission and send you to the next level.
Demo Codes
Press the TAB key to bring up the console, then use the following codes:
