Some doubt about the dispatch method

[杨如鹏]

Dear Xorg fans:
         I'm new to Xorg,and now I'm starting trying to study it.I
read from the main method,and now I'm reading the dispatch method in
dix/dispatch.c.I have some doubts about it.I think it can send message
to the client,but I haven't seen any method call explicit to do
that.So I want to know how the XServer send message to the client in
the dispatch method.
         Thank you.
         Best Wishes
         RuPeng Yang
         2010.11.15