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Pending Review
Use FQDN for machine names
Where the are duplicate computer/machine names (ie DC01, DC02, etc) on different domains it would be useful if the names diplayes on Control used the FQDN where available. This would allow differentiation at a glance.
Customer support service by UserEcho
While this wouldn't be a direct fix for what you're asking, one possible workaround would be if you edit your group, you can add a subgroup expression on with the following text:
GuestMachineDomain
This will break out the list by domain, and at least allow you to see a particular machine more easily if you know the domain you're looking for.