No I dont think so, you won't be able to delete files on the users machine as thats a security risk. I think what happens on most sites like this is that they "reset" the cookie, ie issue a new one that says "This user is logged out" probably using unique ids and timestamping or some such thing. The site probably then checks for the existence of this cookie (also against the date and time) when the user returns. If it doesn't find the cookie, then it will look for the existence of the "Logged in today" cookie. If it doesn't find that either then the user hasn't logged in today.
Bit vague I know, but thats my understanding of it.
Cheers
Joe
'sync' <cr>
The name specified is not recognized as an internal or external command, operable program or batch file.
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