Running asynchronous requests on the SESSION system handle

You can execute a RUN...ASYNCHRONOUS statement using a server object handle or a SESSION system handle. If you use a SESSION handle, the request is executed synchronously on the client as if it was called using a synchronous RUN statement. However, unlike a standard synchronous procedure call that returns the results directly to the RUN statement, the results are returned by the event procedure specified on the RUN...ASYNCHRONOUS statement as though it were responding to a PROCEDURE-COMPLETE event from an AppServer.

Thus, using the SESSION handle, the event procedure runs synchronously as part of the RUN statement and returns execution to the statement immediately following the same RUN statement. This is different from using a server handle, where the event procedure runs only in the context of a blocking I/O or PROCESS EVENTS statement that processes the PROCEDURE-COMPLETE event. However, this still allows you to use the RUN...ASYNCHRONOUS statement to program local and remote requests in a similar way, for example, when an AppServer is not available.