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 Serial I/O Functions
 Overview
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    As described under "Linking", Faxual II can use either its own built-in
    serial I/O functions, or the Telepathy serial communications library, to
    communicate with a fax modem.  The functions described in this section
    are available in either case.  If you use the built-in serial I/O layer,
    these functions call that layer; if you use Telepathy, they call the
    appropriate functions in Telepathy instead.

    In normal use, the only functions from this group you need to call are
    SerOpen(), to open a serial port before using it to send faxes, and
    SerClose(), to close the port when you are done with it.  You may also
    need SerSetup() to use serial ports with nonstandard addresses or IRQ
    numbers.