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 SERIAL/PARALLEL STATUS

 These port functions allow control over the serial and parallel
 ports on the computer.  They include the ability to determine the
 status of a port, initialize a COM port, read and write to the
 ports, and determine whether a device such as a printer or modem is
 ready.  Using C_ISPRINT(), a printer attached to an LPT or COM port
 can be checked to determine if it is on-line and ready to receive
 information.

 C_ISPRINT()              C_COMSTAT()
 C_ISDEVICE()             C_ISCOM()
 C_ISMODEM()              C_ISLPT()
 C_COMINIT()              C_LPTINIT()
 C_COMREAD()              C_LPTSTAT()
 C_COMWRITE()             C_LPTWRITE()