EAServer not only hosts EJB components, it provides interoperability between EJB clients and components and other technologies. There are two areas of interest for EJB interoperability:
Intervendor EJB interoperability, or how you can use EAServer with other EJB application servers.
Intercomponent interoperability, or how you combine EJB components hosted in EAServer with components of other types in the same application.
