PowerModeChangedEventArgs Provides data for the event.

 SessionEndedEventArgs Provides data for the event.

 SessionEndingEventArgs Provides data for the event.

 SessionSwitchEventArgs Provides data for the event.

 SystemEvents Provides access to system event notifications. This class cannot be inherited.

 TimerElapsedEventArgs Provides data for the event.

 UserPreferenceChangedEventArgs Provides data for the event.

 UserPreferenceChangingEventArgs Provides data for the event.

 PowerModes Defines identifiers for power mode events reported by the operating system.

 SessionEndReasons Defines identifiers that represent how the current logon session is ending.

 SessionSwitchReason Defines identifiers used to represent the type of a session switch event.

 UserPreferenceCategory Defines identifiers that represent categories of user preferences.