Confirmed on a nt4ws.sp6 system, compiling the while(1) program with MS Visual C++ 6.0. The system was still running its services like ftp, etc, but the UI was totally useless. Even Ctrl-Alt-Del did not work. Mouse would move, but couldn't click anything. What's interesting is...the test program was also compiled with Cygwin's Cygnus Win32 gcc compiler....and the problem did not occur. It seems this might be a bug with MS C stdio libraries? - Chris -- Chris Gaver Behrens Senior Software Architect XO Communications On Fri, Oct 26, 2001 at 11:35:42AM -0700, Michael Wojcik wrote: > Recent messages on the comp.lang.c and (allegedly) > comp.os.ms-windows.programmer.win32 have documented various short programs > which cause Windows NT4 and 2000 to crash and reboot by writing certain > strings to stdout. > > The following is one example of such a program: > > #include <stdio.h> > > int main(void) > { > while (1) > printf("\t\t\b\b\b\b\b\b"); > return 0; > } [...]