A server can assign the responsibility of sending responses to the requests presented to the server to a different entity. By default, XCF binds this responsibility to the server exit routine. If the responsible entity ends before sending an expected response, XCF sends an acknowledgment to the originating system to indicate that it should no longer expect a response from the target server.

Note that when a server system ends or fails XCF always cancels responses expected from the servers on that system. Thus if the server implementation entails third party notification that specifies another system other than the one on which the server resides to send the results, the possibility exists that XCF might cancel the expected response before the third party system responds. In effect, a race condition can occur between the third party response and the cleanup processing performed by XCF when a system is removed from the sysplex.