This read-write DisplayString identifies the user requesting a SET operation on the BERT group, and is compared against the current bertOwner to authorize the request -- access is only granted if the two match, so every SET request must supply a valid value here. Like bertOwner, this is either a CLI username or an SV+ management station's IP address in quotes. An admin issuing BERT configuration commands from a management application would set this object to their own IP address on each SET so the agent recognizes them as the legitimate resource owner.