[Zope] store data as long as the user is logged on

[gabor]

hi,

i need to store some data as long as the user is logged on to zope.
how can i achieve this?

using the session is not a good idea, because some parts of the code 
simply call session.clear()  (i did not write that part).

if everything fails, i can use a singleton where i put a dictionary 
based on some-kind-of user-id... but i'd like to avoid that if possible 
(don't want to think about the multi-user-asking-at-the-same-time 
problems)..

is there any place where i could attach my data structure?

thanks,
gabor