Parent 962 got PID 963 from fork(962 Computer1)
        963 Computer1

+Parent 962 got PID 964 from fork(962 Computer2)
        964 Computer2

+       965 Computer3
Parent 962 got PID 965 from fork(962 Computer3)

+Parent 962 got PID 966 from fork(962 )
        966 

+wait() ed until -1 was returned.