The Central Data Exchange (CDX) application is a separate product used to transfer data between your office system and the EPA servers. Clicking on the CDX button or menu option will open a new CDX window.
Because CDX is a separate application from AQS you will need to login to the application before you can transfer files.
Once data files are transferred for batch loading you must use the REFRESH CDX button to display and reference the files on the batch load screen