How to check ELS for RHEL4?

I have a number of RHEL 4 servers, and have bought subscriptions for some of them. I can't find a way to associate the new ELS subs with the hosts I want to continue to get updates etc, is there a command I can run t be sure which systems are associated/registered with which subs?

Or perhaps the system is honor based and it's up to me to ensure that only the RHEL 4 systems I have bought ELS for are updating?

If I just run the update command on RHEL 4 it tells me that all systems are up to date but I don't know if this is just because the system I run the command for does not have the ELS entitlement if you see what I mean....

I have asked Redhat for advise on this directly but they have been no help whatsoever so far and frankly are giving me the run-around, so any assistance or sugestions would be very much appreciated.

Many thanks in advance!