Hold down the ALT key while typing in the codes to use them:
FOG? WHAT FOG?          See whole map
BOOST                   Full mana
ELMINSTER               Everything Researched

Typing in these codes will create that creature:
ACOLYTE                 Basal Golem
FATHER                  Cleric
WOLVERINE               Druid
GREMLIN                 Enchanter
FATAL ATTRACTION        Fury
FLYING MONKIES          Gargoyle
RAISE DEAD              Ghoul
ALASKA                  Gnome
JARETH                  Goblin
MERV                    Griffin
BODY GUARD              Guardian
MOTHER IN LAW           Harpy
MICROSQUISH             Juggernaut
SEDUCTION               Nymph
LANCELOT                Paladin
YOGI                    Ranger
CONCRETE                Stone Golem
NEEDS FOOD BADLY        Warrior
MERLIN                  Wizard
SHADOW                  Wraith
SMOG                    Wyrm
DEAD FLESH              Zombie