Push Button Controls
Use a push button to initiate an action or a set of actions. You can designate a single push button to be the one that is activated when the user presses Enter by enabling the Default Pushbutton property.
Message forms have a push button on them by default. The button is configurable.
Subforms and message forms do not have a tool bar; instead, users must use push buttons. The push buttons behave the same as the standard push buttons for other form types.