Issues:
The program should be nice and small so it can load before a user can hit CTRL-ALT-DEL.
Solution:
Compile a single WIN32API call into a small .exe in delphi.
Note:
This was written for Delphi 2 (thus Unit name WINPROCS) and the code actually only works under Windows 3.x and 95/98.
program small;
{written by rleigh@deakin.edu.au (Richard Leigh, Deakin Univesity 1997}
uses WinProcs;
{$R *.RES}
var
Dummy : integer;
begin
Dummy := 0;
{Disable ALT-TAB}
SystemParametersInfo( SPI_SETFASTTASKSWITCH, 1, @Dummy, 0);
{Disable CTRL-ALT-DEL}
SystemParametersInfo( SPI_SCREENSAVERRUNNING, 1, @Dummy, 0);
end.