Sorry, agent display name is not an editable field, but to my knowledge is defined in the whatever code is responsible for discovery and population of agent in the Operational database.

touching DB directly voids the "waranty" and is considered unsupported by product team. The way to change properties of discovered instance is to run different/another discovery and populate instance with new value for given property. This itself carries some risks (discovery is complex business, each instance has a ref-count of discoveries) which may affect instance deletion (when object is removed). Overall, doable but should be seriously considered prior attempting to complete. DisplayName was not supposed to be used inside of workflows when decision is being made, but that cannot be guaranteed either so changing name may cause something stop working ...

Thanks for the feedback Marius,

"The way to change properties of discovered instance is to run different/another discovery and populate instance with new value for given property." Sounds like the better way to go I'll try out later this week, I should have thought of that already as I think I do it (or follow the concept) within my custom MP's already, e.g. (brackets used for formating purposes)

(InstanceSettings)
            (Settings)
              (Setting)
                (Name)$MPElement[Name="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Name>
                (Value)$Target/Property[Type="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Value)
              (/Setting)
              (Setting)
                (Name)$MPElement[Name="System!System.Entity"]/DisplayName$(/Name)
                (Value)MindSrv Srvc on $Target/Property[Type="Windows!Microsoft.Windows.Computer"]/NetbiosComputerName$</Value>
              (/Setting)
            (/Settings)
          (/InstanceSettings)

JoinTheClub, I'll write out my steps and reply here if it works.

Cheers, Aengus