The "EPIC - Test" tab hosts the following testing and training environments.

EPIC - Test (UNT): This environment is used for testing the June release. EPIC - Test (STG): This environment is used for testing E-Invoicing. EPIC - Test (REG): This environment is used for testing the next patch release. EPIC - Test (TRN): This environment is used for training in EPIC.

Note: Click on the appropriate sub-tab above to go to the environment you wish to use.
You may not have permission to view all environments.