如何从客户端计算机检测当前的sharepoint页面？

On the client machine I need to be able to somehow detect which sites the current user are looking at right now. I know the base URL of the sharepoint app, say sharepoint.thecompany.net but how the hack do I get the last requested url from the server? I have hit a dead stop when trying to iterate the current processes and the casting the iexplorer process to something I can work with, I just don't know which kind of object to cast the process to :-(On the client machine I need to be able to some