Contributor: JORT BLOEM { [example on how to trap debuggers cut] > The only problem is that people like me just go around this. Ever tried > to debug Out of this World? They tried every trick possible. I find a better way is to do this: Procedure Annoy_Debugger; Inline($CD/$01); and sprinkle it (VERY!) generously through your code - since it's all inline, it wont be a separate procedure, and thus cannot be disabled from one point.... other tricks include (quietly) checking the byte at the address pointed to by Int 1/3, if the byte contains $CF, then there's no debugger, else quietly jump to $FFFF:$0000 (reboot address). Also, this works very well: A_Word:=$01CD; If A_Word+$1111 <> $12DE Then Kick_Some_But; This will detect search&replaces of CD 01. Self-modifying code also works well, and getting the address of Int 1 and doing a far call....