<a href="www.mysite.com?thing={VALUE}">click me</a>

##</code><code>##

#!/usr/bin/perl

use strict;
use warnings;
use LWP::UserAgent;
user LWP::Debug qw (+);

#Simplified a little bit as real site requires cookies and url redirection etc...

my $ua = LWP::UserAgent->new;

my site = "https://www.secure.com/login";

my $req = HTTP::Request->new(POST => $site);
my $req->content_type('application/x-www-form-urlencoded');

my $req->content('user=a_user&pass=a_pass');

my $req = $ua->request($req);

if ($res->is_success) {
    print $res->content;
} else {
    print $res->status_line, "\n";
}

#Now how do I dump the var=value pairs from this returned page???