Java Security

Hi,

I am new to ssl and authentication. I looked lots of post on this forum regarding server authentication and client authentication. Most of the code examples using both trustmanager for server authentication and keymanager for client authentication. It's understandable that trustmanager is used in client code in order to handle server authentication.

Question: why need keymanager in client code for client authentication, as client authenication should be handled in server code? Or the purpose of keymanager is to feed the client.cer to server during connection?

Thanks for your information. /dan