Make a backup copy of "aesop.exe" because it can be damaged by the
 following: First type [set aesop_diag=1] at the DOS prompt. Start the
 game with [hack]. When you have done this you can use the following
 keys: 
 
  [A] - Destroys all monsters
  [t] - Activates textmode
  [I] - No clipping-mode
  [O] - ?