Hmm, I can't find one either. It seems you should use a 'keyboard hook' for that, which is a bit more complicated, because it needs a pointer to a Function. It is possible, but quite tricky. I believe I saw it on the Russian blitz site once.
However, there is also a DLL, that can block 'intrusive' keys, such as alt+tab, ctrl+esc etc.:
http://www.blitzbasic.com/codearcs/codearcs.php?code=1334
However, there is also a DLL, that can block 'intrusive' keys, such as alt+tab, ctrl+esc etc.:
http://www.blitzbasic.com/codearcs/codearcs.php?code=1334