How to pass variable from form submit function to page callback function in Drupal 6

Question

I have a Drupal form and a submit function that processes that form. I would like to pass data from the submit function to the page callback function that loads after the form was processed.

Answer 1

Well, 10 months later of Drupal development later, I believe the $_SESSION variable is the only way of doing this. Drupal doesn't have any special tools for this.