In full duplex, the most common, the host computers echoes characters to the remote computer. In half-duplex, the remote computer echoes characters to itself. One common emulations is the DEC VT-100 terminal. With appropriate software, a PC equipped with communications hardware can act as a terminal on a mainframe or minicomputer. Students at Millsaps, for example, can dial into the Millsaps system and access any of the mainframes with a proper account.
Electronic mail is message distribution on computer.
With e-mail, you can communicate with people in a local organization, throughout the country, or even throughout the world. D. Computer Bulletin Boards Computer bulletin boards are an extension of e-mail. They provide a forum for messages to people of common interests. Many local organizations maintain bulletin boards. E. Commercial Information Services Commercial information services provide a wide variety of computer telecommunication services for a fee.