use vars qw($_mem $cookie $sess_id $sess_ref $logged_in
$_pgtitle $_title %in $_un $_scripid $_req_dir $_pg
$_page_content $_pageName $_surl %vars $_show_message
$dbh $_dur_time $debug $inc_sess_id);

##</code><code>##

require "/home/username/req/vars.conf";

##</code><code>##

if($_mem) {
  # Do something here
} else {
  # Nope it is empty
}