Adding classes to Zend_gateway.php

Question

<?php
    error_reporting(E_ALL | E_STRICT); //error reporting, not needed

    require_once "Zend/Amf/Server.php"; //the zendAMF server
    require_once "process.php";  //our test class


    $server = new Zend_Amf_Server(); //declare the server


    $server->setClass("process"); //load our test-class to the server

?>

If i try to add another class, its not accepting... i am using the same procedure as above.