What does the Split Screen feature do?

• The feature will divide the screen into left and right sections and simultaneously project two images.
  
  In order to use the Split Screen feature, one of your images must be input through the HDMI or DVI-D (G5450WUNL/G5750WUNL only) port. The other image can be input through the Computer1, Computer2 (G5550NL/G5650WNL/G5950NL only), BNC, S-Video, Video1, or Video2 ports. See Projecting Two Images Simultaneously for instructions.
  
  Note: Images input through the  USB or LAN port cannot be projected as part of the split screen.