When the media player control has focus and the Spacebar is pressed, the user can use the Left Arrow or Right Arrow keys to select which control button to click. 

The EMPNotify type is a method pointer that is called when an OnClick event for a TMediaPlayer components occurs. The Button argument can be one of the following values: btBack, btEject, btNext, btPause, btPlay, btPrev, btRecord, btStep, or btStop. 

The default value of the event handler's DoDefault argument is true. If DoDefault is true, the media player control calls the method that corresponds to the clicked button. For example, if the user clicks the Play button (btPlay), the Play method is called. 

If DoDefault is false, the user must write code that executes when a media player control button is clicked in the OnClick event handler. The following table lists the default methods corresponding to the media player control buttons:

Click