get authentication parameters from tomcat

Firstly sorry, because my english is so bad.

Well, I磎 working in a applet. This applet is into a tomcat server, and to access this i have configurated a basic authentication in tomcat. There are only 3 users. My aswer is, how can i know whose of them have authenticated to personalize the applet with his name?

Thanks for all.

[345 byte] By [Fioguz] at [2007-11-26 10:30:15]