This read-create string, from 1 to 32 characters, names the group to which a given combination of securityModel and securityName belongs, and this groupName is used as an index into the vacmAccessTable to select an access control policy, though its presence here doesn't guarantee a matching vacmAccessTable entry exists. Admins set this to assign an SNMPv3 user or community to a named permission group when configuring view-based access control. For example, setting it to admin-group assigns that security principal to the admin-group group, whose access policy is then looked up in vacmAccessTable.