DB<1> use CGI
  DB<2> $q=new CGI;
  DB<3> p $q->hidden(-name=>'fubar',-value=>1)
<input type="hidden" name="fubar" value="1" />

  DB<4> $q->param(-name=>'fubar',-value=>3)
  DB<5> p $q->hidden(-name=>'fubar',-value=>1)
<input type="hidden" name="fubar" value="3" />

  DB<6> p $q->hidden(-name=>'fubar',-value=>1,-override=>1)
<input type="hidden" name="fubar" value="1" />