[Twisted-web] Authenticating users and refering them to personal URLs based on the authentication result.

Hi I'm just starting with Nevow, and wanted to know if this is possible, and if so get a few leads. I want: 1) to authenticate users (from a form with a "username" and a "password" field) based on data stored in a database. 2) after authentication is performed, the user is sent to a URL based on some of the data from the database. For example, if the database query revealed him to be named "John Smith", he shall be refered to http://appserver.com/JohnDoe. Subsequently, he should remain at this URL, and all links should refer to addresses "below" his personal address. For example, http://appserver.com/JohnDoe/configuration, http://appserver.com/JohnDoe/mail, etc. Thanks in advance, Xif