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PidTagControlId Canonical Property
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Contains a unique identifier for a control used in a dialog box.
MAPI display table
This property contains a unique identifier for the control. This identifier should contain a GUID structure and a binary value of type LONG. All controls in the dialog box should use the same GUID to identify the service provider, and each control should use a unique LONG value to ensure that the controls do not collide.
This property is used in notifications. For example, notifications sent on the display table must set this property to uniquely identify the control to update.