GUI Documentation Cleanup
Hopefully, you've already noticed the new R3 GUI documentation. You should find the new documentation infinitely more readable than what was posted in DocBase.
The revision of the docs has been spirited forward by a few developers who are willing to invest in moving the GUI module forward again. So, I took some time out to rewrite the documentation, clarify the main concepts, and provide many working examples with screen-grab images.
Also, even if you're not interested in the GUI, take a look at the R3 Event System pages, because parts of that document relate to how all events are handled, including modules like network schemes.