Writlaus

When I read your post and started responding, I typed this:

"That would be a good idea, but I thought about it and realized that if I set that session variable in page 1, nothing is keeping them from typing in the address of page 2 right after that. Page 2's check for the variable would then test true, and the page would then be used."

But now I realize that that would actually work for me. If I just deleted the session variable at the end of page 2, then it is impossible for them to reuse that page directly after. They'd either use the button I'd provide and have page 2 do the work, or go to it themself, and have page 2 do the work. Either way, in the end, the work has been done and the session variable is deleted, which works fine for my needs.

So thank you for your suggestion! =D