I have automatic re-login via some session cookies in case the user 
variables have timed out.  I keep a user log (userid, IP, userreference, 
logintime, logouttime, loginmethod=prompt or cookie).  I query this log, 
GROUPed BY userreference, to give me usage data that includes total 
elapsed time as well as actual usage.

This is a cose where purging the UserReference session cookie could be 
useful -- so two userids don't get combined.  Though I could use a key 
consisting of userid+userrefernce to solve this.

>I can't think of a single issue where it would be necessary to 
>deliberately purge the 
>Witango_UserReference session-cookie. 


Bill Conlon

To the Point
345 California Avenue Suite 2
Palo Alto, CA 94306

office: 650.327.2175
fax:    650.329.8335
mobile: 650.906.9929
e-mail: mailto:[EMAIL PROTECTED]
web:    http://www.tothept.com


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