You haven't provided enough information to answer the question definitively, but it's probably "no". First, when asking a question, please remember to provide the product name, version, and platform. In this particular case it doesn't matter (unless you're using ES for .NET), but it's often relevant. In your case, it's not clear what you mean by "service calls", or what the scope of "multiple" is. If you're talking about a single client invoking COBOL EJBs (or a plain Java client invoking COBOL services mapped as EJBs), then it's possible to make that service stateful. A stateful service is processed by a dedicated SEP process that lives for the lifetime of the session. For stateless EJBs and Web Services, however, this isn't an option. Nor can you have service requests from different clients (or different sessions in the same client) handled by the same SEP. You could run an ES server with only a single normal SEP, or jury-rig some kind of single execution process architecture using a custom request handler. I would not recommend either.
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