EJB3/JNDI problem with swing client

Hi all,
i'm a newbie in J2EE and now try to test simple stateless session bean
(EJB3) on JBOSS 4.0.4GA with Swing client.
The problem is - when running the client on the same java machine as
jboss everithing is ok, but when i try to run client from another
machine - lookup of the bean failes.

What am i doing wrong?
How can i get to know which jndi name to use in lookup()? Can i see it
somewhere in "jmx-console" of jboss? How jndi-name in lookup() differs
accoding to witch java machine it is running on?

My texts are:
-----------------------DirManager.java-------------------------------------
package cis.sessionbeans.dir;

import java.util.*;
import javax.ejb.Remote;

@Remote
public interface DirManager {
    public List<Person> listPeople();
    public void savePerson(Person p);
}

-----------------------DirManagerBean.java------------------------------

package cis.sessionbeans.dir;

import javax.ejb.*;
import javax.persistence.*;

@Stateless
public class DirManagerBean implements DirManager{

    @PersistenceContext(unitName="cis")
    private EntityManager em;

    public List <Person> listPeople(){
        ...some code...
    }

    public void savePerson(Person p) {
        ...some code...
    }
}
------------------------CISClient.java----------------------------------------

....some code...

Properties props = new Properties();
props.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
props.setProperty("java.naming.provider.url","jnp://myiphere:1099");
props.setProperty("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");
InitialContext ctx = new InitialContext(props);
Object ref = (Object)ctx.lookup("CIS/DirManagerBean/remote");

....some code...

To tell the truth, accoding to the tutorial i should write
lookup("DirManagerBean/remote") , but it doesn't work. I've found the
name "CIS/DirManagerBean/remote" after experiments, where CIS - the
name of ear (?)

really need your help
thanks

Sveta

p.s. sory for bad English