Epson PowerLite L200SX 3600-Lumen XGA Short-Throw Laser 3LCD Smart Projector - Manual (Page 227)

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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