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  In this section, we're going to describe the general process of putting a
  program together from two or more program modules. Programming languages--
  and programmers--vary in the way they perform this process, but in
  general, the tools you use and the sequence of operations you carry out
  are the same for most language translators. (See Figure 19-3.)

  +----------------------------+
  |       Source code          |
  |                            |
  +----------------------------+
                |   Language translator
  +-------------.--------------+  Library manager  +----------------+
  |     Object code (.OBJ)     |.-----------------.| Object library |
  |(or other intermediate code)|                   |     (.LIB)     |
  +----------------------------+                   +----------------+
                |   Linker
  +-------------.--------------+
  |    Executable program      |
  |          (.EXE)            |
  +----------------------------+
                |   EXE2BIN
  +-------------.--------------+
  |    Executable program      |
  |          (.COM)            |
  +----------------------------+

  Figure 19-3.  Building an executable program. By convention, object
  filenames use the .OBJ extension; object libraries use .LIB; executable
  files use .EXE or .COM.