what do you mean by 'access the cluster'?
If you use HTTP you're right, Apache do the work, there is no mechanism from JBoss side for this.
Different is the RMI requests of EJB.
Here the Remote interfaces are only proxies, the logic inside will manage the cluster.
The proxy is provided by JBoss if you use JNDI (port 1099) or HA-JNDI (port 1100), but for sure you should use HA-JNDI in case of having a cluster configuration.
This proxy will be updated automatically with the actual cluster-view.
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THANKS!!! Now i finally understand... Yup that was precisely what i need to know.