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  1. or download this
    ?history=view1,view2,view3
  2. or download this
    my ($q, %param, @history);
use CGI;
$q = new CGI;
...
if (defined $param{history}) {
  @history = split(',', $param{history});
}
  3. or download this
    push @history, $param{view_page}
  4. or download this
    my $history = join(',', @history);

my $page1url = $q->url(-absolute=>1)
...
my $page2url = $q->url(-absolute=>1)
               . '?history='
               . $history&view_page=view2;