hi! take a look at the parent.asm.. I don't know whether someone has used it before but I think it might be nice anti-debugging trick.. what is it about? well, there's a info in a PSP area (see TechHelp or something like that) that tells us what program is running.. so if we look there we can find that we're debugged or anything.. sounds nice but there's a problem.. this routine works fine with debug, TD, TEU, DUMPCOM and others but doesn't work with TR, Cup386 and this kind of more sophistical programs.. they are trying to behave like they were COMMAND.COM ! so if you're curious you can play with the asm source and perhaps tell me if you've done something with it :) if you use it in your protector please give me a credit.. ;) I'm assuming that this trick was not shown in public, maybe I'm wrong.. have a nice debugging:) MaX / MovSD , http://maxmp.home.ml.org