Epson EMP 1815 Operation Manual page 16

Using Multi-Screen Display
B
Select the "Use multi-display" check box.
"Display layout" and "Display properties" buttons are added at the
bottom of the screen. Click the "Display properties" button to
adjust the display.
Display layout
You can display the arrangement set on the computer's
"Display properties" screen. The arrangement cannot
be changed here. Click the "Display properties" button
to change the arrangement.
Display properties You can display the "Display properties" screen and
change the settings.
C
D
The display
arrangement is
displayed here.
Select the number of the virtual display to allocate
to "Display", and set which image to be projected
from which projector.
Click the "Connect" button.
The image allocated to each projector is projected.
16