Cheat:
 Note: This procedure involves editing a game file; 
 create a backup copy of the file before proceeding. 
 Use a text editor to edit the "ca.ini" file in the 
 game directory. Change the lines "infiniteammo=0" 
 to "infiniteammo=1" and "invulnerability=0" 
 to "invulnerability=1" to activate unlimited