Job by job: click on the dash next to the blue arrorw of your currently running job. Go to Job Huntgroup and make sure that only the computers that you want to use have check marks next to them. Then apply.
By default: Go to Scheduling->Huntgroup and do the same thing.
Note: if any of the computers that you want to use say (no alfserver for RemoteCmd) then that means they're currently not on the renderfarm. This is a problem that we're currently working on.
Comments on this page to Chad Lyle.