Variable-Transfer in two forms

I have 2 different forms on 2 sites (because one form would be too long). Now I would like to have all the variables of form1 in form2.
This code in "Form HTML" isn't working:

<?php
$variable1=$_POST['variable1'];
?>

How can I get the varibales in form2?
Thanks for your help!

Hi Spider1747,

The easiest way is to use the Multi-page plugin to link the two forms together,

Bob