How to identify sessions

[Mark Proctor]

I would  like to store additional session data for a sesssion. I was 
going to do this by having a HashMap in the FtpLet, but I need to find a 
unique key for the request. Currently I can only think of using 
connection time and user name, but this cannot be guaranteed to be 
unique. Could we maybe have a long counter that is incremented for each 
connection which can be used as an id and always available from the 
FtpRequest?

Mark