1. In a computer network, a method, comprising: maintaining at a controller at least one set, each set comprising a grouping of at least one computing device; providing at the controller a selection corresponding to at least one computing device; providing at the controller a job corresponding to at least one operation to perform on the selection; sending a message from the controller to each computing device in the selection, the message instructing the computing device that receives the message to execute the job; and at the controller, storing results of the job from each computing device in the selection.