How to use remote JMS in websphere5?

I want to use JMS in another server to send message so that I config required jndi in server. When I lookup local JMS jndi(connection factory, queue) it works correctly. But when I lookup remote connectionfactory, it throws 'javax.naming.CommunicationException'. BTW, local configuration is same as JMS server. And I use WSAD 5.1.1 to develop it.
The first question is if I need use JMS server on another server, I should lookup remote queue and JMS connection factory on that server, right?
The second question : If yes, how to obtain remote JMS connection factory? I use WSAD 5.1.1 trail, I don't know is it possible to obtain remote jndi.
The third question : do I need change any configuration for supporting remote JMS client instead of local(same compute, different jvm) environment?
The following is my client code to obtain remote queue:
public class Test {
     public static void main(String[] args) {
          Properties env = new Properties();
          env.put(Context.INITIAL_CONTEXT_FACTORY,
                "com.ibm.websphere.naming.WsnInitialContextFactory");
          env.put(Context.PROVIDER_URL, "corbaloc:iiop:10.240.4.203:2809");
          try {
               Context initialContext = new InitialContext(env);
               Object obj = initialContext.lookup("jms/IPharmQueue1");
          } catch (NamingException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
}It works ok when ip is localhost. But it can obtain remote queue or connectionfactory. I tried to lookup other EJB, it also failed.

Actually, I have application in one server and four same server as cluster. But only one server provides JMS service. So my application need to use remote JMS server instead of local server. But in my development environment I can not simulate cluster environment as customer environment. So I try to let my application access remote JMS server in different computer. When two server start up I found my application will get local JMS connection factory and queue instead of remote factory. Even I put IP of another computer in PROVIDER_URL.
I did a application client to test it. The code is above. But it can not lookup remote jndi.
I use WAS5 as server and WSAD 5.1.1 as development IDE.
Is any idea about it?

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Actually, I have application in one server and four same server as cluster. But only one server provides JMS service. So my application need to use remote JMS server instead of local server. But in my development environment I can not simulate cluster environment as customer environment. So I try to let my application access remote JMS server in different computer. When two server start up I found my application will get local JMS connection factory and queue instead of remote factory. Even I put IP of another computer in PROVIDER_URL.
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Your current approach will get into trouble very easily. However with a little thought, it is fixable.
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