The framework calls this member function to notify an application of a change in session state.
This method receives the WM_WTSSESSION_CHANGE notification, which is described in the Windows SDK.
The nSessionState parameter specifies that a session is connected or disconnected from the console or a remote terminal, a user logged on or off, a session is locked or unlocked, or a session has changed to remote-controlled status. For more information, see the wParam parameter of the the WM_WTSSESSION_CHANGE message.
This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.
This method is supported in Windows Vista and later.
Additional requirements for this method are described in Build Requirements for Windows Vista Common Controls.