In order for certain operations in the operator environment (such as alarm area filtering) to function correctly, AREA_A must be one of these assignments.
The Alarms and Events object under a Remote Client Session object does not support the Event Chronicle database and therefore does not have an associated Properties dialog.
The assignment of an area to Alarms and Events for a Remote Client session does not limit the areas to which the user has access; the user's span of control is determined by User Manager settings. Rather, the area assignment defines which operator alarms will be seen by a user using that terminal session.