The Webcast Communicator accepts a single composite video signal, so to get any image from a PC like a Word document, scanned picture, Excel spreadsheet etc, is simply a matter of converting the output of the computer to a composite video signal, and connecting that cable to the Webcast Communicator instead of the camera cable. Note: It is not recommended to switch cables during an active broadcast as this will disrupt the stream - use a video mixer to switch (or mix) video signals...but that's another subject.
There are many ways to get a composite video signal from a computer. The easiest would be to use a device that already has a composite video output. For example, iPads have optional adapter cables (dongles) which can be purchased to do this, and some laptops have a composite video jack, etc.
The most common device people use in conferences is a PC laptop and the VGA or HDMI output port. Those ports can be used if the signal is converted to the correct composite video signal.
A VGA port is about an inch long and has 15 pin-holes. The outer shell is shaped like a "D". An HDMI port is also shaped like a "D" but is very thin and only about 1/2 inch long. These ports are usually activated when something (like a projector or other monitor) is plugged in or by pressing the Windows key and P simultaneously, which pops up a screen with an option to duplicate displays. Selecting duplicate will put the picture on the laptop screen and also the VGA or HDMI port.
To convert the signal, a converter box called a "Scan Converter" is necessary. They cost about $25 (on up). If you are comfortable with eBay, search for "
VGA to TV scan converter" or "
HDMI to composite converter"
I prefer to purchase used professional equipment that is built to much higher standards becuase they are more stable and generally last longer, and cost about the same (
such as the Extron VSC-50, 75 or 100 models).
After all this, I suspect you are attempting to put the hymns lyrics on the screen during the congregational hymn at a conference. If that is the case, check out
this post for additional direction.