Warning()

         Shows a warning at line 24

    Syntax:

         Warning( cWarning, [lMode], [cColor] ) -> Nil

         cWarning : The warning to show
         lMode    : Optional action mode
         cColor   : Optional color

    Description:

         If lMode is .T. the function displays a msg and waits for a key
         restoring the screen. If lMode is .F., it doesn't wait for a key nor
         restores the screen. Default value is .T. Default color is "W/N".

    Return:

         Nothing.

    Example:

         Warning( "Push any key" )
         Warning( "Processing, please wait...", .F. )