Here are some examples of ways pass through data can be used.
1. Passing information from the inbound link to the click tracker or rotator.
2. Passing data from an inbound link to an outbound link.
3. Passing data to a CPA company for postback uses.
4. Passing data to a thank you page.
5. Passing data to another data collection script that then passes the surfer on to the final destination URL.
6. Passing a query string exactly as received to the outbound exit link.