Language Reference Guide : System Classes : InputEvent Class : MouseButton Attribute
 
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MouseButton Attribute
Data Type: integer
4GL Access: RW
The MouseButton attribute identifies the mouse button whose action triggered this event.
Valid MouseButton values are any combination of the following, or zero if no button is pressed:
MK_LBUTTONDOWN
MK_MBUTTONDOWN
MK_RBUTTONDOWN
For more information about system constants for these values, see MouseButton Settings.