Thanks. This helped, although it still didn't work. I found the solution in the help file although I still had to experiment. The description below is one way for it to work, although there are probably other ways.
To get it to work from one computer to another, you have to export from the QTB an sdp file. This file gets stored on the viewing computer. On the QTB computer, on the Network tab, the IP address needs to be the viewing computer's IP. Once broadcasting, the QT Player on the viewing computer opens the sdp file. It should then work. If anything on QTB get changed (MPEG-4, etc), you need to export another sdp file.