Techie thing (you can use this in conjunction with the Alt-= cheat   
below)

ctrl-alt-rshift-f12  to find your current coordinates

"Customer Cheat:"  B-I-G for health and jetpack power
   
   The following work in v1.1 of Harry only:
   
   CTRL-R-E-N      activates all weapons, activates god mode 
                   for less than 1 minute. This mode gets    
                   disabled at the end of each level. This   
                   mode must be active to use other modes.   

  ALT-L           beep will sound and display will freeze, 
                  type 11, 12, 13, 14, or 15 to warp to    
                  respective level 1.1, 1.2, 1.3, 1.4, 1.5 
                  typing wrong level numbers will dump     
                  program to DOS.                          

  ALT-=          (type coordinates to change location)

Start the game with the command line password 'skip' (ie; hh1 skip) 
and the game will start directly at the main menu.