Epson PowerLite 7550C User Manual page 30

You can connect the projector to two video sources simultaneously
(for example, a computer and a VCR), and you can connect a
separate audio source for each video source.
If you will be using the optional ELP Link III software, you'll also
need to connect the ELP Link III cables. See Chapter 4 for
instructions after you finish connecting the projector to your
computer.
Note: If you want to use the remote as a mouse and your computer
doesn't have a PS/2 mouse connector, you must use the ELP Link III
kit to connect the projector to a computer.
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1 • Setting Up the Projector