Scripting

I need code samples for using the Post Data to HTTP Server action in the Wise for Windows Installer. I want to pass a user ID to an asp page on the server so it can be checked against a database of customers with valid support contracts. I have the asp code that runs the check, but I don't know how the field and data values are passed to the asp page. I am unable to assign the passed value, if there is one, to a session variable to check the database.

Also, how are any error codes passed back to the script so it know if it was successful or not? Is there a way to see the error code so that conditional statements could be included in the script to either proceed with the install or abort it?