[Seaside] How can I access the authenticated user of a request?

[Ian Prince]

For a small application I am building for a client (FWIW: a 
directory/file browser with access control based on the user/password), 
I need to access the "authenticated user" part of a request.

WARequest>>user seems to be what I want but how do I access the request?

My apologies if I'm missing something obvious.

Thanks in advance,

Ian.