CONTENTS

 1     Introduction
 2     Electronic messaging
        2.1     Operational characteristics
        2.2     General description
 3     Interactive Internet and Intranet applications
        3.1     Operational characteristics
        3.2     General description
 4     File transfer
        4.1     Operational characteristics
        4.2     General description
 5     Digital voice
        5.1     Operational characteristics
        5.2     General description
 6     Software defined radio
        6.1     Operational characteristics
        6.2     General description