Test cases in the format of the test tools of external manufacturers (e.g. Mercury Interactive), can be used in CATT via a standardized CATT interface. The test cases must be of type External application, and the external test tool must be installed on the frontend where the SAPGUI runs. The interface between CATT and the external test tool is based on Control Enabling Technology. You can call the external test tool and create, edit and execute a test case from CATT. You can use all CATT functions to manage and analyze the test case.

The CATT interface is a functionality enhancement to use external test tools in CATT test cases. Common Internet Browsers are also supported, so SAP Internet application components can also be tested.

To test SAP Internet application components, the external test tool must have a special SAP enhancement. See the manufacturer documentation for whether this enhancement is possible.