PRESS TAB once, then type in one of the following codes:

 

All ammunition	allammo
External view	behindview 1
Normal view	behindview 0
Reset bad textures on walls or creatures	flush
Fly mode	fly
No clipping mode	ghost
God mode	god
Hide all monsters, weapons, and items	hideactors
Show all monsters, weapons, and items	showactors
Disable invisibility	invisible0
Invisibility	invisible1
Kill selected monsters	killall <monster name>
Kill all monsters	killpawns
Level select	open <map name>
Disable timer	playersonly
Set game speed (1 is normal)	slomo <number>
Summon weapon, item, or monster	summon <item>
Suicide	suicide
Walk mode; resets no clipping and flight modes	walk

After calling up the game console with the tilde key (~), type:

summon klingons.<item>

where <item> can be:

Daktagh (weapon 1)
Disruptorpistol (weapon 2)
Disruptorrifle (weapon 3)
Assaultdisruptor (weapon 4)
Spinclaw (weapon 5)
Grenadelauncher (weapon 6)
Rocketlauncher (weapon 7)
Sithhar (weapon 8)
Particlecannon (weapon 9)
Batleth (weapon 10)
Cipherkey
Genetickey
Palmkey
Passcardkey
Retinalkey
Combatarmor
Combatgoggles
Communicator
Gagh
Tricorder
Vacsuit

This is only a partial list of the items that can be summoned in the game.