No, it
doesn't disable Ctrl-Alt-Del. However, Task Manager does (on my computer, at least) not come up occasionally when in mid-game, although it's only ever happened before when Half-Life 2 hanged :/
As for ALT-TAB and ALT-F4 (which the help file says it should), on my XP SP2 box I can vouch for ALT-F4, and on my Windows 2000 laptop ... the same.
I assume it all works on Windows 9x systems, as those were the ones DarkBASIC was designed on & for.
Still, nice to know Windows have improved their security, huh?
Btw, people who ask why Disable SystemKeys don't work are either trying to make a logon screen, or a virus. In DarkBASIC. Thus, "the only virus that requires DirectX 8.0".
How's my typing? Phone 0800-GO-TO-HELL