# UNTESTED SNIPPET
use LWP::UserAgent;
$ua = new LWP::UserAgent;
use HTTP::Cookies;
$cookie_jar = HTTP::Cookies->new;
$init_url = 'http://www.domain.com/cgi-bin/whatever.pl?X';
$request = new HTTP::Request('GET', $init_url);
$cookie_jar->extract_cookies($response);

#  later....
$request = new HTTP::Request('GET', 'http://www.domain.com/cgi-bin/whatever.pl?Y';
$cookie_jar->add_cookie_header($request);
$response = $ua->simple_request($request);