use strict;
     use CGI;
     use CGI::Carp qw(fatalsToBrowser);
     use CGI::kSession;
     use CGI::Cookie;
        my $cgi = new CGI;
        my $last_sid = $cgi->param("SID");
        my $c = new CGI::Cookie(-name=>'SID',-value=>$last_sid);
        my ($id, $key, $value);
        my $s = new CGI::kSession(path=>"/tmp/");
        print $cgi->header(-cookie=>$c);
        print $cgi->start_html();
        if ($last_sid) {
            # note: the following I used for mozilla - your mileage may vary
            my $cookie_sid = (split/[=;]/, (fetch CGI::Cookie)->{SID})[1];
            if ($cookie_sid) {
                print "<b>We are now reading from the cookie:</b><p>";
                $id = $s->id($cookie_sid);
                $s->start($cookie_sid);
                print "The cookie's id: $cookie_sid<br>";
                print "Here's the test_value: ".$s->get("test_key")."<br>";
            } else {
                print "<b>We are now reading from the URL  parameters:</b><p>";
                $id = $s->id($last_sid);
                $s->start($last_sid);
                print "Last page's id: $last_sid<br>";
                print "Here's the test_value: ".$s->get("test_key")."<br>";
            }
        } else {
            print "<b>Here we will set the session values:</b><p>";
            $s->start();
            $id = $s->id();
            print "My session id: $id<br>";
            $s->register("test_key");
            $s->set("test_key", "Oh, what a wonderful test_value this is...");
            print "Here's the test_value: ".$s->get("test_key")."<br>";
        }
        # note: the first click will set the session id from the URL the
        #           second click will retrieve a value from the cookie
        print "<a href=".(split/\//,$0)[-1]."?SID=$id>Next page</a>";
        print $cgi->end_html();