1. A method of facilitating processing of operator message commands in a computing environment, said method comprising: executing a send message instruction by a processor image of the computing environment, the executing comprising: selecting a subchannel for determining a path to a coupling facility coupled to the processor image; and sending a send message command block to the coupling facility, the send message command block comprising a start operator message command block for a start operator message command, the start operator message command block including an operator message token, the operator message token uniquely associating an operator message command generated by an initiator with a buffer of a plurality of buffers of the coupling facility, the plurality of buffers to track operator message commands from multiple sources coupled to the coupling facility, and the buffer including one or more fields to be populated based on executing the start operator message command, the one or more fields including an operator message token field to include the operator message token, the operator message token identifying the buffer associated with the operator message command; and wherein the sending of the send message command block comprises sending the start operator message command to the coupling facility for processing at the coupling facility.