Moves to the beginning of the next track of the currently loaded media.
If the current position is at the last track when the Next method is
called, Next makes the current position the beginning of the last track.
If the multimedia device doesn't use tracks, Next goes to the end of
The Wait field determines whether control
is returned to the application before the Next method has finished.
The Notify field determines whether
Next generates a MM_MCINOTIFY message.