Epson PowerLite 800F 5000-Lumen Pixel-Shift Full HD Ultra-Short Throw Laser 3LCD Projector (White) - Manual (Page 233)

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Multiple Projector Operation Settings - Multi-Projection Menu
Settings on the Multi-Projection menu let you set up multiple projectors to project a single unified image.
Setting Options Description
Projector ID Off
1 through 9
Assigns an ID for the projector
when you use multiple projectors
HDMI Out Setting Pass Through
Off
Set to Pass Through to enable
up to four projectors connected
via HDMI cables to project a
unified image.
Number of Projectors 2 to 4 Sets the number of projectors
used to create a unified image;
this setting is displayed only if
HDMI Out Setting is set to Pass
Through