Programming

./myprogram &

int main(int argc,char **argv)
{
     pid_t pid=fork();
     if (pid)
     {
            printf("started as %d\n",(int)pid);
            exit(0);
     }

     rest of program
}

main()
{
     // parent running
     while(1)
     {
         child = fork();
         if(child==0)
         {
            // child running
            grandChild = fork();

            if(grandChild==0)
            {
                   // grand child running
                   exec();
            }

            wait();         // child must wait for grandChild
       }
            if()              // a condition to test for &
                  wait(); // doesn't exist then wait
   }
}