There are many reasons you may want to connect a second monitor to your desktop or laptop ,while it's simple
Make sure you have all the hardware you need ,double-check your computer's settings.
Make sure that you have a dual display supported hard disk
Do you have the right cable? Most likely your computer and monitor use a VGA or DVI-I or HDMI interface, so you just need to make sure they've both got the same kind of port. If not, you need to pick up an adapter.
Connect your second monitor. If you don't see a dual-monitor display near the top of your monitor screen, click "Detect" or check to make sure the monitor is connected properly.
Open your control panel
It may change in other windows versions
Hardware and sound > Display > Change display setting > Select and apply Multiple displays
After successfully connecting the second monitor,You can change the resolution and orientation
That's how it works.For basic dual-monitor use, this is all you need to know.
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