In order to extend the functionality offered by XML-RPC servers without impacting on the protocol, I've included experimental support in this release for reserved methods.
All methods starting with system. are considered reserved by the server. PHP for XML-RPC itself provides three special methods, detailed in this chapter.
This method may be used to enumerate the methods implemented by the XML-RPC server.
The system.listMethods method requires no parameters. It returns an array of strings, each of which is the name of a method implemented by the server.