How to switch off internal macbook screen when using external monitor(s)

as far as i observed, adding external displays ( running different screens on them, not mirroring)  to a macbook pro  increases the gpu workload and with that comes temperature rise in the laptop and increase in ventilator noise - and probably increased hardware aging and risk of component faillure due to high temperature inside the laptop.
simply try connecting two external 27" screens and open some flash video on both of them. then run a temperature monitoring software and watch temps rise, compared to running same flash videos / demanding tasks only on one connected external screen or only on the laptop screen with no external monitor connected.
especially in mavericks, due to its increased background routines, such a set-up appears ever the more taxing, then again who does not love apple`s nice adds showing laptops with two 27” screens connected to it and the workspace vision they invoke....
i have seen temps around 100° to 102° celsius on a 13" macbook pro 2012 edition, which i would expect is territory where the cpu / gpu temp safety switches will trigger system shutdown any time soon ( hardware status before verified as fully in order by apple service and default osx installation)
imagine your anti-virus software starting some realtime content screening while runnign some demanding tasks already and the system shuts down easily (all such situation observed in reality)
(would be interesting to see how a retina display macbook fares with 2 external monitors running demanding tasks, considering the retina display already increased taxing for the gpu - any experience from users of such a setup would be very much appreciated as it will provide critical purchase decision intelligence for all of us envisioning a retina-book and two big screens adoring our desks...)
turning down the macbook`s built-in screen`s backlight may reduce power consumption but i have not seen any evidence that it switches off the gpu-to-screen feed and respective gpu load - it certainly did not prevent gpu, cpu, board, etc temps to rise to borderline levels.
so the key question here is, how to switch off the macbook pro`s built-in screen in order to avoid gpu cycles being wasted on that screen ( and the resulting heat developments)  when working with big external screen(s)  connected to the laptop ?

this thread talks about running several monitors as advertised by apple and running demanding task on them.
with the lid open, the keyboard offers a very efficiant heat escape vector, which is blocked when the lid is closed - this is a basic and commonsense insulation effect.  this thread also mentions the use of temperature monitoring software and thus a repeatable test setup. the temps recorded were also mentioned. they rose when the lid was closed, the running task remaining unchanged. as far as i could track down the cpus in discussion will shut down around the 105 degree celsius range. i observed system shut downs when the system approached 103° celsius.  not to mention that the fans will run loud well before that.
again this is on hardware checked and ok-ed by apple service.
the question still welcoming an expert answer: is there any way to switch off the built-in macbook monitor while the lid is open ?

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    # File generated by xorgconfig.
    # Copyright 2004 The X.Org Foundation
    # Permission is hereby granted, free of charge, to any person obtaining a
    # copy of this software and associated documentation files (the "Software"),
    # to deal in the Software without restriction, including without limitation
    # the rights to use, copy, modify, merge, publish, distribute, sublicense,
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    # Software is furnished to do so, subject to the following conditions:
    # The above copyright notice and this permission notice shall be included in
    # all copies or substantial portions of the Software.
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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    # Except as contained in this notice, the name of The X.Org Foundation shall
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    #    Identifier  "Mouse2"
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    #    Option     "MaxX"          "15184"
    #    Option     "MinY"          "15372"
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    #    Driver     "elo2300"
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    #    Option     "MaxX"          "3868"
    #    Option     "MinY"          "3858"
    #    Option     "MaxY"          "272"
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    #    Option     "ReportingMode" "Scaled"
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    #    FontPath   "/usr/share/fonts/TTF"
    #    FontPath   "/usr/share/fonts/Type1"
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    #    FontPath   "/usr/lib/X11/fonts/misc/"
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    #    FontPath   "/usr/lib/X11/fonts/100dpi/:unscaled"
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    #    FontPath   "/usr/lib/X11/fonts/TrueType/"
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        FontPath     "/usr/share/fonts/75dpi:unscaled"
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    #    Load       "glx"
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    #    Option     "Protocol"      "Xqueue"
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    #    Option "LeftAlt"     "Meta"
    #    Option "RightAlt"    "ModeShift"
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    #    Option "XkbVariant"  "nodeadkeys"
    # If you'd like to switch the positions of your capslock and
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    #    Option "XkbRules"    "xorg"
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    #    Option "XkbLayout"   "us"
    #    Option "XkbVariant"  ""
    #    Option "XkbOptions"  ""
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    #    VideoRam    256
    #    Clocks    25.2 28.3
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        Driver      "vga"
        VendorName  "Unknown"
        BoardName   "Unknown"
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        Driver      "vesa"
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        Driver      "fglrx"
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        Device     "* Generic VESA compatible"
        Monitor    "My Monitor"
        DefaultDepth     24
        SubSection "Display"
            Viewport   0 0
            Depth     8
            Modes    "1280x800" "800x600" "640x480"
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            Depth     16
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            Viewport   0 0
            Depth     24
            Modes    "1280x800" "800x600" "640x480"
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        Device     "aticonfig-Device[0]"
        Monitor    "aticonfig-Monitor[0]"
        DefaultDepth     24
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        FontPath    "/usr/share/fonts/X11/cyrillic"
        FontPath    "/usr/share/fonts/X11/100dpi/:unscaled"
        FontPath    "/usr/share/fonts/X11/75dpi/:unscaled"
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        FontPath    "/usr/share/fonts/X11/100dpi"
        FontPath    "/usr/share/fonts/X11/75dpi"
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        Load    "bitmap"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
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        Driver        "kbd"
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        Option        "XkbRules"    "xorg"
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        Option        "XkbLayout"    "us"
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        Driver        "mouse"
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        Option        "Device"        "/dev/input/mice"
        Option        "Protocol"        "ImPS/2"
        Option        "ZAxisMapping"        "4 5"
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        Driver        "synaptics"
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        Option        "Device"        "/dev/psaux"
        Option        "Protocol"        "auto-dev"
        Option        "HorizScrollDelta"    "0"
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    Section "InputDevice"
        Driver        "wacom"
        Identifier    "stylus"
        Option        "Device"    "/dev/input/wacom"
        Option        "Type"        "stylus"
        Option        "ForceDevice"    "ISDV4"        # Tablet PC ONLY
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    Section "InputDevice"
        Driver        "wacom"
        Identifier    "eraser"
        Option        "Device"    "/dev/input/wacom"
        Option        "Type"        "eraser"
        Option        "ForceDevice"    "ISDV4"        # Tablet PC ONLY
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        Driver        "wacom"
        Identifier    "cursor"
        Option        "Device"    "/dev/input/wacom"
        Option        "Type"        "cursor"
        Option        "ForceDevice"    "ISDV4"        # Tablet PC ONLY
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    Section "Device"
        Identifier    "ATI Technologies Inc ATI Radeon XPRESS 200M 5955 (PCIE)"
        Driver        "ati"
        BusID        "PCI:1:5:0"
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        Identifier    "Generic Monitor"
        Option        "DPMS"
    EndSection
    Section "Screen"
        Identifier    "Default Screen"
        Device        "ATI Technologies Inc ATI Radeon XPRESS 200M 5955 (PCIE)"
        Monitor        "Generic Monitor"
        DefaultDepth    24
        SubSection "Display"
            Depth        1
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        4
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        8
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        15
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        16
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        24
            Modes        "1280x800"
        EndSubSection
    EndSection
    Section "ServerLayout"
        Identifier    "Default Layout"
        Screen        "Default Screen"
        InputDevice    "Generic Keyboard"
        InputDevice    "Configured Mouse"
        InputDevice     "stylus"    "SendCoreEvents"
        InputDevice     "cursor"    "SendCoreEvents"
        InputDevice     "eraser"    "SendCoreEvents"
        InputDevice    "Synaptics Touchpad"
    EndSection
    Section "DRI"
        Mode    0666
    EndSection

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    xrandr --output VGA --auto
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