I used to run a dual head VGA/mono debugging setup back in the day. I used this to great effect cracking one of the Mechwarrior games for myself.
I remember cracking Mech Warrior (2?) via flipping a bit on the executable (and changing the drive letter of a path somewhere), it was so amazing when it just worked!
Oh wow, I'd forgotten all about that! It felt like science fiction when I got that working.