Advanced users may now access some of the game's internal debugging commands (which 
include features such as immortality) by running the game with the command line option 
"-debug" (e.g. "AVP.exe -debug").

In this mode Multiplayer is not available, levels will not be flagged as completed, 
and no new official cheat modes will become available. This basically means that 
players can examine a level to which they already have access with invulnerability,
infinite weapons, etc. but can't open up any new game levels or features.

The following CONSOLE COMMANDS are made available by this option, in-game help is 
available by typing in "LISTCMD" at the console:

"GOD"            - makes the player immortal: player will still take damage, but 
                   will not die when they reach zero health.
"GIVEALLWEAPONS" - self-explanatory.
"SHOWFPS"        - displays the current frame-rate per second on-screen.
"SHOWPOLYCOUNT"  - displays the number of rendered polygons per frame on-screen.
"LIGHT"          - creates a light source near the player. Repeated use makes a 
                   brighter and brighter light.