So called insertion technology has three flavors:  
cable, antenna, and phone line. 

The  2 - w a y  signal can arrive through 
a separate tv channel, FM radio waves, 
existing telephone lines, or 
satellite dish.
"Use background or theme music to provide an experience more like television."

all on one plate
infinite possibilities

The cost will depend on the method.

"Remember, the television audience is different from a PC audience."

"Are there words...[or]... gapimages that can be eliminated, split up, or moved to another screen?"

from WebTV Style Guide (Draft) 19 NOV 1996