有没有办法以编程方式决定连接哪个WCF会话？

I need to be able to use WCF Session capability in a Silverlight application. Currently Silverlight only supports basicHttp binding, so this is impossible. My thoughts are to create a middle piece with wsHttp capabilities that will handle the Sessions for me and my sessionless Silverlight app can pass in the SessionID guid. I need to be able to use WCF Session capability