Activation and Deactivation buttons display on the Domain Watch > Probe Deployment tab.
Activation - Enables incremental discovery and synchronization of domain controller data on a fixed time period. Activating a probe on a domain computer deactivates any other probe on that same domain, without loss of data.
Clicking Apply Changes after modifying policies on any Policies tab performs an "on demand" incremental synchronization. Activation performs a recurring incremental synchronization.
Activation is not required to run full sync on the Domain Watch > Schedule and Status tab.
Deactivation - Disables incremental synchronization updates from the domain. If reactivation occurs later, a "changes gap" may exist in the data collected by the probe, requiring the scheduling of a full synchronization to correct.