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The Enterprise JavaBeans (EJB) technology defines a model for the development and deployment of reusable Java server components, called EJB components .

An EJB component is a nonvisual server component with methods that typically provide business logic in distributed applications. A remote client, called an EJB client, can invoke these methods, which typically results in database updates. Since EAServer uses CORBA as the basis for the EJB component support, EJB components running in EAServer can be called by any other type of EAServer client or component, and even CORBA clients using ORBs from other vendors that are compatible with CORBA 2.3.EJB server The EJB server contains the EJB container, which provides the services required by the EJB component. EAServer is an EJB server.

for read more information:
http://ssa.usyd.edu.au/docs/easfg/easfeatp25.htm