Hi!
Thanks for a quick reply. Somehow I've missed Understanding CGI::upload_hook(), the example shown there did give me a hint how to solve my problem. I've set a cookie with the ID and read it before creating the query object. Here is my code:

sub get_cgi_query
{           
     my %cookies = CGI::Cookie->fetch;
     my $hook_id = $cookies{CGISESSID}->value unless !defined($cookies
+{CGISESSID});
     if (defined($hook_id))
     {   
         return CGI->new(\&hook,$hook_id);
     }   
     else
     {
         return CGI->new();
     }   
          
}
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