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 MCOL()
 Determine the mouse cursor's screen column position
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 Syntax

     MCOL() --> nCurrentMouseColumn

 Returns

     MCOL() returns the mouse cursor's current screen column position.

 Description

     MCOL() is a function that is used for determining the mouse cursor's
     screen column position.  This is useful when implementing a hit testing
     routine whose purpose is to determine if the mouse cursor is on
     pertinent information when the left mouse button is pressed.