This is primarily for programmers working on DCE devices. We strive to ensure that all similar devices use the same commands and events and to some extent data so that they are interchangeable. For example, if someone creates a remote control screen to adjust lights, he will add an 'on', 'off' and 'dim' command to the buttons. All DCE lighting devices should respond to these same basic commands in the same way so that the remote control is usable with all of them.
The DCE pages let you see all the data, commands and events that devices use, how they are organized into categories, and what devices use them.