The following JSON-RPC methods are supported (try these using the MapControlService test page):

getLayerObject(layerType, id, language)
reverseSearch(x, y)
system.about()
Returns a summary about the server implementation for display purposes.
system.listMethods()
Returns an array of method names implemented by this service.
system.version()
Returns the version server implementation using the major, minor, build and revision format.

The following method(s) of this service are marked as idempotent and therefore safe for use with HTTP GET: