ok, I find it hard to believe this whole "lost the manual" thing.

but I use this sequence to test KQ4 in NAGI all the time:
when it asks for the code.. press "alt-d"
type in "pirate"
after you have a laugh, restart kings quest 4
when it asks for the code.. press "alt-d"
type in "marble"
The only problem is that some parts of the game are in "debug mode" now and you get a little H at the bottom of the screen when there's cinematic bits.
- Nick