If a machine in a Remote PC Access machine catalog is not assigned to a user, Studio temporarily assigns the machine to a Delivery Group associated with that machine catalog. This temporary assignment provides information, so that the machine can be assigned later to a user. The Delivery Group to machine catalog association has a priority value.
Priority determines to which Delivery Group that machine is assigned when it registers with the system or when a user needs a machine assignment. The lower the value, the higher the priority. If a Remote PC Access machine catalog has multiple Delivery Group assignments, the software selects the match with the highest priority. You can set this priority value using the PowerShell SDK.