Script to run "CTRL+ALT+BACKSPACE"

What command exactly is run when you press the keys "CTRL+ALT+BACKSPACE"? I have some times where I need to have a script restart my X-session. As a user I can press CTRL+ALT+BACKSPACE any time I want and restart my graphic session, but I do know how to do this from a script. Can anyone tell me how?

killall X|kdm|gdm|xdm ?

it is built into X itself
I'm not sure but a killall X then maybe you would need to run KDM , GDM or XDM
then what ever started started X or it may respwan on it's owen
try a " killall X "from an xterm and what happens

Here is a small C program that does the real Control-Alt-Backspace thing:

#include <stdlib.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/extensions/XTest.h>
#include <X11/keysym.h>

int main(int argc, char **argv)
{
  Display *display;
  int foo;

  if((display=XOpenDisplay(NULL)) == NULL)
  {
      fprintf(stderr, "%s: can't open %s\n", argv[0], XDisplayName(NULL));
      exit(1);
  }

  if(XTestQueryExtension(display, &foo, &foo, &foo, &foo) == False)
  {
      fprintf(stderr,"XTEST extension missing\n");
      exit(1);
  }

  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Control_L), True, CurrentTime);
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_Alt_L), True, CurrentTime);
  XTestFakeKeyEvent(display, XKeysymToKeycode(display, XK_BackSpace), True, CurrentTime);
  XCloseDisplay(display);
  return 0;
}

Exercise it with caution !