MROW()
 Determine a mouse cursor's screen row position
------------------------------------------------------------------------------
 Syntax

     MROW() --> nCurrentMouseRow

 Returns

     MROW() returns the mouse cursor's current screen row position.

 Description

     MROW() is a function that is used for determining the mouse cursor's
     screen row 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.