4. Generally, we say that there is interoperability between two components X and Y when they can interact based on a (degree of) mutual understanding.
5. For example, you may want to listen to a video on a POTS phone, interact with a database service using your TV, or have a videoconference with two of your colleagues at the same time when one of you is using a computer, one is using a screen phone, and the third is using a TV. The situation today is that each user would use a distinct CPE depending on the purpose.
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