Please note that the specifications and other information contained herein are not final and are subject to change. The information is being made available to you solely for purpose of evaluation.
Implementors receive notification as the system is entering sleep, and after
the system wakes.
This notification is useful for disconnecting from network services prior to
sleep, or re-establishing a connection if the network configuration has
changed during sleep.
Called when the system is about to sleep. Note: This message may not be
delivered prior to the actual system sleep, and may be processed after
the corresponding wake has occurred.