This read-only DisplayString, up to 64 characters, is described as the login ID of the dialup user if the connection uses Xauth, left as an empty string when Xauth was skipped. An admin reads this to tie an active dialup tunnel back to a specific named user account rather than just an IP address, which matters for access auditing on shared or dynamic-IP connections. For example, an admin auditing active VPN sessions would expect to see a recognizable login like 'jsmith' in this field for any dialup connection authenticated via Xauth.