Since I have been playing with gmcp again due to various projects, I got a little annoyed that the documentation on it is incomplete or sometimes wrong. So I set about documenting the missing features and correcting the wrong ones.
You can follow my progress on this github repository
. If you have own things to share, feel free to fork it and send an pull request!
Keep in mind this is a work in progress.
For those wanting the official docs: I got news they will get updated soon as well.