[web2py] Run a method when ever logout is reached.

[Jason Brower]

I need to make sure curtain session data is wiped when the user is 
logged out.
This bring up two things:
1: How can I run a method like that to make sure this happens when ever 
the logout is clicked.
2: I wonder if there could be a spacial area of sessions that is just 
for that users authenticated session.
BR,
Jason Brower