A PC configured with two display devices is the most common. I recommend using two cables to independently connect to each. One HDMI and one Display Port.
You have the option of setting up your display as Extended or Mirrored. Think of extended as the two display devices sitting "side by side". The most common choice is to use Mirrored so the projector and the monitor show the same image. I consider this a little more convenient when you are using the mouse and keyboard because you can look at the screen instead of turning your head and having to look at the projected image. This can become a bit of a pain if you are trying to read small font that's 12 feet away.
Another tip on screen resolution. There are three things you want to have aligned to the same (similar) aspect ratio. The physical hitting screen, the projector, and the display on your PC. The physical screen will be close to a 4:3 aspect ratio, so you will want the projector display set to 4:3 (instead of 16:9), and the screen resolution on your PC set to a resolution that is in a 4:3 ratio (e.g. 1600x1200). You will get the best coverage results of the projected image on your screen if all three are set to 4:3 aspect ratio.
The 16:9 aspect ratio is typically what you see with a television. It is more rectangular with an even longer width compared with the height. If you use a 16:9 aspect ratio for your projector or your screen resolution, you will probably see unused bands at the top and bottom of the projected image.
Your PC may not offer 1600x1200 screen resolution, which is exactly a 4:3 ratio. Look for another choice that is still 4:3 (1280x960) or close to 4:3. For example, 1280x1024 is a 4:3.2 aspect ratio.
Here is an example of a laptop set to display resolution 1600x1200, and the projector set to display 4:3 on a screen that is measured 144” wide and 106” tall (aspect ratio close to 4:3). All are closely aligned to a 4:3 aspect ratio.
The image below shows the PC is set to 1920x1200 (16:9). Notice the bands at the top and the bottom where the projected image doesn’t cover the screen.
The game is a good fit on the laptop, but not on the projected image.
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