Chapter 11 shows how to use the communications ports on an
NT workstation (serial and parallel ports). 

bbs.cpp
  This code demonstrates the comm code needed to create a 
  bulletin board.

chap12.mak
 Use the File option in the Project menu to compile
 the different programs in this directory with Visual C++.

comm.cpp
  This code demonstrates a simple serial connection.

makefile
  Change the APP variable in the makefile to compile the
  different programs in this directory with the SDK.

term.cpp
  This code demonstrates the comm setup for a simple terminal 
  emulator program.