Press 't', enter the code and hit return. Quotation marks around the strings are NOT necessary. You will have to download patch 1.01b. Go to www.Warzone2100.com and look under the download section to download.

time toggle - starts, stops timer
get off my land - kills all enemy units on map
show me the power - 1000 extra power
whale fin - strange number of power
hallo mein schatz - next level
work harder - completes all research
double up - harder units
kill selected - kills the selected units
john kettley - toggle weather rain,snow,clear
biffer baker - almost invulnerable
sparkle green - stronger units
timedemo - shows frame rate and gfx engine data. 
easy  - sets easy difficulty level. 
normal - sets normal difficulty level. 
hard - sets hard difficulty level. 
version - tells you when the game code was compiled.