There are a number of reasons for using a dual-monitor setup. In the office, you may want to have a productivity app open on one screen and email on the other. At home, you might want to duplicate the content on a tiny laptop screen on your giant flat-screen TV. Taking advantage of multiple-monitor functionality is a little different with Windows 8, but the advantages make it well worth the effort.
With screen real estate, as with the dirt version, more is generally better.
Like earlier incarnations of the OS, Windows 8 has external monitor functionality that lets you spread out. However, there are Windows 8-specific features -- like the snapping of apps that lets you use apps side-by-side to do two tasks at once; and communications like Skype video calls -- that especially benefit from having more screens.
You may find it convenient to have an email box always open on one desk-based monitor, with another displaying apps. That way you're not repeatedly minimizing proper work to see who's pinging -- just glance over.
I use a dedicated Dell Inspiron Mini laptop with a 10.1-inch screen for television services like Slingbox and Hulu. Piping directly into a television's HDMI port, the laptop acts as a remote control.
Following is a guide to using multiple monitors in Windows 8.
Identify the available ports on the PC and monitor or TV. Look for HDMI (High Definition Multimedia Interface) ports, and use them if available.
HDMI technology carries audio and video in the same cable, and it is smart enough to know when the cable is connected and when it isn't. Most recent laptops, monitors and televisions feature HDMI.
Older alternatives are VGA and DVI technologies. You can buy a DVI to HDMI adapter. Desktop PCs sometimes have a combination of serial ports -- DVI and HDMI -- as do some monitors and TVs. In that case, just match the cables.
Tip: Avoid docking stations that use USB. There can be graphics-rendering issues, because you're adding a layer of complexity that can limit the ability of the video card and monitor to work responsively together. You can get them to work, but it can be a lot of trouble.
Plug the HDMI or other cable into the PC and secondary television or monitor. Then turn the devices on.
Windows 8 will automatically detect the second screen.
Point to the upper-right or bottom-right corner of the first screen and select the Devices charm. Then click the Second Screen link.
Select Duplicate to replicate the same image on both screens; Extend to spread out; or Second Screen Only to blank the primary screen and use only the secondary screen.
Tip: Duplicate works well for multimedia when you want to source video with a laptop and stream the results on a television. Extend works well in a desk environment when you want to spread out across screen real-estate.
Press the Windows keyboard button in conjunction with Page Up to toggle screens when in the Extend screen mode.
The Windows button plus Page Up moves the current app to the left monitor. The Windows button plus Page Down moves the current app to the right monitor.
Tip: The Start page appears on one screen only. If you want to use an app obtained from the Windows Store, first open it, and then flip it to the screen you want it on using the Windows keyboard button along with the Page Up or Down procedure.
Classic desktop-based apps -- those that used to be called "programs" -- don't have this anomaly. They can appear on both screens.
Tweak the screen resolution if prompted when running apps. Windows 8 should automatically figure out the correct resolution for both screens. However, sometimes you may get error messages telling you resolution isn't correct when you run certain apps -- particularly with televisions.
Place the mouse in the bottom-right corner and choose Search. Enter the term Control Panel and click on the result.
Select Adjust Screen resolution from within the Appearance and Personalization subhead.
You'll see the two screens represented graphically as icons in a likely more familiar Windows 7 or earlier type interface. Make resolution drop-down changes, choose Apply, and try the app again.