When the Acknowledge All command is used on any of the picture types (Alarm List, Alarm Filter, faceplates using ActiveX Controls, pictures that use individual parameters and the ALARMS parameter in datalinks), only one signature is required to acknowledge all alarms on the picture. However, the Event Chronicle will contain a SIGNATURE entry and a CHANGE entry for each alarm acknowledged. When using the Acknowledge All command, be aware that the most stringent signature policy for any of the modules found on the picture is applied.