Firstly: You must have the AvP save-game patch installed.
            Secondly: Add -lampcxtr -debug to the command line.
            ie: "C:\Fox\Aliens Versus Predator" -lampcxtr -debug
            Then when in the mission press the tilde (~) key to bring down the
            console and then you can type the following codes:
            "QUICKSAVE"/"QUICKLOAD" which always save/load to/from the first
            save slot.
            "SAVE #"/"LOAD #" (# is a number from 1-8) which save/load to/from
            slot number #. "SAVESLEFT" displays how many saves the player has
            remaining in the current level at the current difficulty. This
            number is also displayed any time a game is saved or loaded.
            Normal Console Commands and Variables
            The following CONSOLE VARIABLES are made available (replace the #
            sign with a number), in-game help is available by typing the
            "LISTVAR" command at the console:
            "MOTIONTRACKERVOLUME" - this is set at its maximum of 1.0 by
            default, the volume of the tracker can be reduced by changing this
            number (e.g. to 0.75 or0.5).
            "CROUCHMODE" - this new console command allows players to change the
            Aliens crouch/crawl to a toggle on/off key by typing "CROUCHMODE 1"
            at the console. "CROUCHMODE 0" changes back to the default setting.
            Debugging Console Commands and Variables
            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.
            Bot console commands:
            "ALIENBOT" - creates an Alien in front of the player.
            "MARINEBOT #" - creates a Marine (or civilian) of type #.
            "PREDOBOT #" - creates a Predator of type #.
            "PREDALIENBOT" - creates a Predator-Alien.
            "PRAETORIANBOT" - creates a Praetorian Alien.
            "XENOBORG" - creates a Xenoborg.
            Note: creating bots may cause crashes and unexpected game behavior.
            For a bot to be created its model must exist in the current level;
            however, the models may be forced to be loaded through a command
            line option. Add "-l" followed by a list of letters corresponding to
            the characters you want to load:
            The following CONSOLE VARIABLES are made available (replace the #
            sign with a number), in-game help is available by typing the
            "LISTVAR" command at the console:
            "MOTIONTRACKERSPEED" - allows the player to speed up/slow down the
            pulse rate of the Marine's motion tracker (range from 0-16, default
            is 1).
            "TIMESCALE #" - change the rate at which time flows in the game,
            e.g. "TIMESCALE 0.5" will make time pass at half the normal speed.
            For those interested, the "JohnWooMode" cheat uses this effect
            dynamically, so that time passes slower the more action is happening
            on screen.
            "WIREFRAMEMODE #" - display the environment and/or characters using
            wireframe graphics.
            "DOPPLERSHIFT #" - enable/disable the Doppler shifting on the Alien
            player's sounds.
            "SKY_RED #" - change the red component in a sky.
            "SKY_GREEN #" - change the green component in a sky.
            "SKY_BLUE #" - change the blue component in a sky.
            "LEANSCALE #" - change the amount the camera tilts when
            side-stepping.