To test applications developed using your COBOL development product, you need to run them under Server Enterprise Edition, for which you need licenses. Net Express is shipped with complimentary Server Enterprise Edition licenses, called developer test licenses.
To test applications, you need Server Enterprise Edition installed on a separate machine from the machine where Net Express is installed. You can arrange for Server Enterprise Edition to be installed as part of your installing your application. You also need to install the developer test licenses on the Server Enterprise Edition machine. See Installing Licenses Using AppTrack.
If you need more Server Enterprise Edition licenses for testing your application than provided, you must purchase additional licenses and install them.