/* Simplest worm program */
main()
{
for(;;) if (fork()!=NUL) exit();
}

/* fork() creates an identical copy of the calling process.  It returns
   the process ID of the child process to the parent task, and returns
   NULL to the child task.

   This code fragment creates a new process with fork().  The process that
   called fork() is returned the process ID, so it goes on to exit.  The
   process created with fork() is returned NULL, so continues, and loops
   back to do it's own fork().

   This causes a process that continously changes its process number.

   In fact, a simpler version would be:
   main() { for (;;) fork(); }
*/