Connecting your laptop to a PC has many merits, in fact there are probably many ways where you could benefit by using your LCD display alongside your laptop in your daily routine. Plus, as most laptops have a handy "external display output" port the whole set-up is rather straightforward.
The main advantage of connecting a laptop with a stand-alone LCD is that it means users have a large screen and high resolution dual display environment. A laptop screen isn't difficult to work on it's just a larger, high-resolution screen is more user-friendly. For example, the increased vertical resolution makes applications such as web browsers, document displays and editing far easier to use / perform. If you use a wide-screen monitor you'll also be able to have various windows open on one screen which means you won't have to click in-and-out of documents when working with multiple items. A larger monitor connected to a laptop is also useful when showing clients images as they won't have to squash around your laptop screen when viewing their images.
Another plus is that you can run software on your laptop, such as Photoshop, but actually view your images and edit them on the larger display while your laptop has the tool palettes you use open on it.
You'll need to know what the maximum resolution that the laptop's external display output can handle is before set-up. This is because some older laptops may have a lower upper limit when it comes to the output than newer models do. When it comes to the monitor, one which offers dot-by-dot display, which displays the input resolution as it is, or one with an enlarged display, which maintains the screen's aspect ratio as it is, are good choices.
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