QuickOPC User's Guide and Reference
Conditions - Disabling/Enabling, and Applying Comments
In order to change a condition instance to the Disabled state, use the IEasyUAAlarmsAndConditionsClient.Disable method.
In order to change a condition instance to the enabled state, use the IEasyUAAlarmsAndConditionsClient.Enable method.
In order to apply a comment to a specific state of a condition instance, use the IEasyUAAlarmsAndConditionsClient.AddComment method.