Sony VGN-Z790D - Manual (Page 104)

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Using Peripheral Devices >
Using the Multiple Monitors Function
To use the Multiple Monitors function
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The monitor port on your computer is not accessible when the computer is attached to the docking station.
The screen resolution of your external display may change when you switch between the performance modes.
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For selecting a video controller, see Selecting Performance Modes (page 112) .
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Your external display may not support the Multiple Monitors function.
Certain software applications may not be compatible with Multiple Monitors settings.
Make sure that your computer does not enter Sleep or Hibernate mode while you are using the Multiple Monitors function. Otherwise, the computer
may not return to Normal mode.
If you set different colors on each display, do not expand a single window across two displays. Otherwise, your software may not work properly.
Set fewer colors or a lower resolution for each display.