• _{manages data transmission}
  • _{out of the PC's serial port}
  • _{through a serial cable}
  • _{into a local modem}
  • _{on to a phone line}
  • _{through the other PC's modem}
  • _{into the the other PC through its serial port}
  • _{communication software would}
    • _{store phone numbers}
    • _{dial phone numbers}
    • _{answer the phone}
    • _{manage transmission of files between two PCs}
    • _{provide terminal emulation}
    • _{examples would include Procomm and Exceed}