All click trackers and rotators can be passed data using an HTML GET query string. The data passed can be used by the click tracker and rotator and/or passed through to the destination URL in a HTML GET query string.
Here is an example URL that contains a HTML GET query string.
https://domainname.com/tracker.php?a=der4566g&sid=abcd&source=fredssolos&cost=.50&category=mmo
Here is a breakdown of what the query string is passing to the click tracker.
[a=der4566g]
This is the click tracker code that identifies the click tracker the URL points to.
[sid=abcd]
The sub id abcd is being passed to the click tracker using the key sid.
[source=fredsolos]
This is an example of passing the source of the click to the click tracker. In this case the click came from fredsolos.
[cost=.50]
This is an example of passing the cost of a click to the click tracker.
[category=mmo]
This example passes a category to the click tracker. In this example mmo is being passed.
NOTE: The above are just examples. Only the a= and sid= are reserved keys that have specific use by click trackers and rotators. The other keys are user generated.