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                                 L_YPRESS()


Syntax:        L_YPRESS(<expN>)


Purpose:       To determine the mouse cursor position on the vertical
               axis at the last key-press of the specified button.


Arguments:     <expN> is the button of interest.
               0 = Left button
               1 = Right button
               2 = Centre button ( if 3 button mouse )


Returns:       An integer value of the vertical position of the mouse
               cursor.
               -1 = Syntax Error


Usage:         Useful to determine if the specified button was pressed
               on a particular row of screen.

               Useful in conjunction with L_XPRESS()


Examples:      * Where on the vertical axis was the mouse
               * when left button was last pressed ?
               left = 0
               horz = L_YPRESS(left)


Language:      Assembler