Early versions of the ZMF REST API documentation, and a number of the videos generated at the same time, refer to two separate applications, zmfrest and zmfevent, distributed in war files of the same names. In ZMF 8.2 Patch 4 and later, however, only the zmfrest application is provided. Why is this?

The very simple answer is that, as mentioned in the ZMF 8.2 Patch 4 Readme file, the zmfevent application was merged into the zmfrest application in that release. However, a more comprehensive explanation can also be found here.