Most notebook PCs have an external VGA graphics port, and you can switch between using it and using the built-in LCD display by pressing the Fn key in combination with one of the function keys.
On my Compaq Presario laptop, it’s Fn+F3, for example. Pressing that combo toggles between LCD only, external only, and both on at once.If your notebook supports it, you can also use the DualView feature in Vista to extend the desktop across both monitors. Normally when you enable both monitors at once, both show the same
thing, but with DualView, each can show separate content. Most modern display adapters with multiple outputs will support DualView. The biggest problem is ensuring that you have enough video memory to support two monitors from the same display adapter. In addition, you’ll need a device driver that works with DualView. Some display adapters only support DualView when you download the latest driver from the vendor.
Note:- Given the current state of display adapter technology, most desktop machines that support Vista can also support DualView. This means your desktop machine could have two monitors attached to it, even though you don’t have two display adapters.
DualView is almost like the multiple monitors and except that on a laptop, the primary monitor is always the built-in one; an attached external monitor is always the secondary one.Not all laptops support the DualView feature. To determine whether yours does, and to try it out if possible, hook up an external monitor to the laptop and enable both displays (with an Fn key combination). They should both show the exact same thing. That part should work even if the video chipset does not support DualView.
Then try the following procedure
Right-click the desktop and choose Personalize, then click the Display Settings link.
If your PC supports DualView, there will be two separate monitor icons there. If not, there will be only one.
If there are two, click the one for the external monitor, and then click Extend My Windows Desktop onto This Monitor and Click OK.
The desktop is now stretched out over both monitors rather than them both showing the same thing.
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