Web Table 1: EventType Property Values
Value	Name	Description
100	BEGIN_SYSTEM_CHANGE	A system change has begun.
101	END_SYSTEM_CHANGE	A system change has ended.
102	BEGIN_NESTED_SYSTEM_CHANGE	A nested system change has begun. A subsequent nested call doesn't create a new restore point. Subsequent calls must use END_NESTED_SYSTEM_CHANGE.
103	END_NESTED_SYSTEM_CHANGE	A nested system change has ended.