IXR_IntrospectionServer::addCallback( $method, $callback, $args, $help )

Source

File: wp-includes/IXR/class-IXR-introspectionserver.php

function addCallback($method, $callback, $args, $help)
    {
        $this->callbacks[$method] = $callback;
        $this->signatures[$method] = $args;
        $this->help[$method] = $help;
    }