You have JBoss Enterprise Application Platform (EAP) 4.3, which is a version only available to those who purchase a support contract.
There are two primary differences between JBossAS 4.2.2 and JBossEAP 4.3:
1) EAP contains Seam (everything but seamgen, noit sure the rationale behind leaving out the coolest function)
2) EAP 4.3 uses JBoss Messaging instead of JBossMQ
In addition, EAP has most of the services locked down already. The readme file contains more details about the differences.
Thanks, Peter. I think I understand now.