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in reply to Can a cookie created via CGI.pm be deleted by CGI::SESSION?

If you use a module, do you read the documentation?
It's right there on cpan: CGI::Session
delete() Deletes a session from the data store and empties session data fro +m memory, completely, so subsequent read/write requests on the same o +bject will fail. Technically speaking, it will only set object's stat +us to STATUS_DELETED and will trigger flush(), and flush() will do th +e actual removal.
Update: Whoops, i did not read your question well enough, sorry :$.

Yes you can, just re-create the cookie and delete it (but the answer was already given.

"We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise." - Larry Wall.