How to communicate between two servlet applications.

I want to write a program that the system manager can see who is connecting the server.
the system manager login the server via the browser with applet.
the applet communicate with servlet .and the servlet work in the server get the customer message such as username ,Ip address etc from other servlet.
how to realize it .?
can you give some advice .
I appreciate you .
thank you

Look at, http://forum.java.sun.com/thread.jsp?forum=54&thread=262144

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

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