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Business Delegate in business tiers

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I understand Business Delegate (BD) is for presentation-tier to hide the detail of accessing business logic. Can this be applied inter-EJBs? An EJB uses BD to hide an access detail to another EJB. Or is there any specific pattern for this?

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A Business Delegate can use a Service Locator(also a singleton) to look up access to session beans. A Business Delegate maps to a Session Facade (session bean).

SCJP, SCWCD, SCBCD, SCEA (part 1), IBM-484, IBM-486
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