Hi,

i needed to put in place form-based login and page access control, and
looking around there are only bits and pieces of suggestions and code
to show how this is done. So I have tried to put them together into a
working demo, and extended altdemo.py, in qx2, to show how this can be
done in a clean idiom, using AccessControlled and _q_access and
NotLoggedInError.

All comments welcome.

I do not know if you want to replace the altdemo.py with this... if you
do not, maybe we should stick it on the wiki or so...

Related question:
What is a good way to ensure that a qx session is expired if the user
quits the browser?
Is there a way to make the qx session cookie not written out to disk?

Cheers, mario