What is the best way to pass variables between 2 applications...

I have a regular website on my domain, but have the secure SSL part of my website on a shared domain given to me by my host.

When I call my web form on the shared domain, I need to pass some variables to that form (which is not sensitive).

There are 2 methods I can think of:

1. Send the variables using a query string.

2. Create a temporary table in a database to store the details, which can be retrieved by the secure web page.

I prefer method 2, but am not sure how to store the user id details, because when the browser redirects to the secure page on the shared SSL domain, I want to make sure that it is the same user, and not another user. What type of information would I need to store in the temporary table, which I could test for. Would the IP address be sufficient here. How is this normally done??

Many thanks for any help.

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