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    frame.el:(set-active-alpha) (set-inactive-alpha)
        add check routine for input alpha
        add an optional argument for `frame' object
        add explanation to Doc. that Alpha value must be between 0.0 and
        1.0
    frame.h:
        delete "extern x_set_(in)active_alpha"
    (mac|w32)fns.c:
        add "extern void x_set_frame_alpha"
        x_set_inactive_alpha
            extern --> static
            add check routine the value of frame parameter
            add check routine for frame highlight
            call x_set_frame_alpha to reflect alpha value to frame opacity
            immediately
        x_set_active_alpha
            extern --> static
            add check routine the value of frame parameter
            add check routine for frame highlight
            call x_set_frame_alpha instead of own transparency routine     
    w32fns.c:
        add SetLayeredWindowAttributes_Proc set_layered_window_attributes_fn
        use pointer of function to accommodate system version differencies
    macterm.c
        use "Gestalt" routine at executing instead of "#ifdef" when building
    w32term.c
        call set_layered_window_attributes_fn instead of
        SetLayerdWindowAttribute directly
    w32term.h
        add macro definitions