1. A computer program product for testing a coupling facility of a computing environment, said coupling facility being coupled to one or more processor images of the computing environment, said computer program product comprising: a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: receiving by the coupling facility an operator message command from a source remote from the coupling facility, the source being other than a console of the coupling facility, and the operator message command having an operator message token associated therewith to identify a buffer for use in processing the operator message command, the buffer comprising a token field for storing the operator message token; processing by the coupling facility the operator message command to perform an action on the coupling facility; and providing by the coupling facility a response to the operator message command, the response to be analyzed to determine an affect of the action on the coupling facility.