1. A method of facilitating processing of operator message commands in a computing environment, said method comprising: obtaining, by a coupling facility of the computing environment from a source separate from, but coupled to the coupling facility, an operator message command and a token associated with the operator message command, the operator message command to specify, by the source separate from, but coupled to the coupling facility, an action to be taken on the coupling facility to test at least one of reliability and performance of the coupling facility; using the token associated with the operator message command to provide a buffer of the coupling facility to store the operator message command, the buffer usable in performance of the operator message command, and wherein the buffer comprises a token field for storing the token associated with the operator message command; performing the operator message command, the performing using the buffer; and providing a response to processing the operator message command, the response to be available to the source of the operator message command.