Here is a list of all related documentation pages:

Backwards Compatibilty
Building XPMP2 and the Sample Plugin
Contrails
Copying <tt>.obj</tt> Files for Replacing Animation dataRefs and Textures
dataRefs available to CSL Models
Deploying XPMP2-based Plugins
How to Use XPMP2
XPMP2 - Developer's documentation
Model Matching
XPMP2 Remote Functionality
Shared dataRefs providing Textual Aircraft / Flight Information
Sound Support by X-Plane 12
TCAS and AI/multiplayer Support
Wake Turbulence Support
<tt>xsb_aircraft.txt</tt> File format
Deprecated List