If I'm understanding you correctly, I think you want
$session->clear( ... ). You can use it to remove a single
parameter ( $session->clear('paramname') ), multiple parameters
( $session->clear([qw(paramname1 paramname2]) ), or the entire
content of the session ( $session->clear() ).
To delete the session itself, use $session->delete().
Depending on context (in particular in persistent environments like
FCGI), you might also need to call $session->flush() after manipulating session contents, in order to
explicitly synchronize in-memory with on-disk representation of the
session data.
(BTW, I'm assuming we're talking about CGI::Session.)
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