Pass variables in register.php?

[dtarrance]

Okay, I'm thinking this would be pretty easy to implement, but for some reason I just can't get it to work. Here's the situation:

I want to be able to have a variable (called subid) passed to register.php, and have it carry over thru the various pages that it generates. Here is an example:

link: register.php?subid=3

So when that link is followed, the variable subid is "remembered" thru all of the pages. Essentially that variable will be passed to a different page after the registration is completed. The user need not be aware of this number to keep things simple.

Could the register.php file be modded, or would using a custom profile field that is auto populated with the correct value be the best way to do this?

Hope that I was clear enough in this post so you can understand what I'm trying to do!

Many thanks in advance to anyone who can help!!!

David