Abstract: Disclosed is a method and system for receiving and transmitting confidential documents and the like via facsimile machines. The system includes a security code-responsive, computer-controlled store and forward facility (SAFF) for receiving and transmitting documents between two remote facsimile machines. A security code is provided by the sender for each document transmission. The number does not identify a subscriber or a mailbox but identifies a fax message. Various degrees of security may be provided in sending a faxed document from a first location to a second location.

Abstract: A system and method for transferring digital data via the sub-carrier of a commercial broadcast FM radio station. Digital data generated by an originating subscriber is shaped with substantially a raised cosine response in the time domain. The shaped signal is then pre-emphasized and used to frequency modulate (direct angle modulate) a sub-carrier. The sub-carrier in turn frequency modulates the carrier and the data is transmitted by the radio station along with its commercial program. A receiving subscriber detects the sub-carrier and decodes and displays the originated data.

Abstract: Local to long-distance interconnections at the remote units are effected without necessity of voice connections through the centrally located processing unit.

Abstract: A centrally located processing unit controls the use of long-distance communication circuits and records the use of the circuits. The centrally located processing unit selects the least expensive telephone line available and instructs the remote satellite to thereby insure the optimum use of bulk rate communications lines. Where no desired bulk rate communication facility is available, a user enters a call-back number into the processing unit and is called back at that number when the facility becomes available.