IsLShift()

         Determines if the Left Shift key is pressed

    Syntax:

         IsLShift() -> lPress

    Description:

         Determines if the Left Shift key is pressed returning a logic
         value.

    Return:

         A logic value indicating if is pressed or not.

    Example:

         If IsLShift()
           Warning ( "Left Shift is down" )
         EndIf