Thanks for your replies.I now can understand the procs and distributed a little.
I found the true bug when run this tutor code on a linux machine.It seems the windows OS only support sharedfile inter-process communication method.And Because of the file permission issue,it reported a Runtime error with no error messege.It also reported a same Runtime error w/ a ‘Permission denied’ message.
Hope official team would fix this ‘bug’ (cause an error with no explicit messege is really annoying)