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  The next basic step is to link the object modules together. The linker, or
  link-editor program (known as LINK in DOS) performs two main tasks: It
  combines separate object modules (as needed), making all the necessary
  connections between them; and it converts the modules from an object-code
  format to a loadable program in the .EXE format.

  The actual combining, or linking, of program modules to create an .EXE
  file is the most important aspect of this discussion. We'll take it up
  again later in this chapter, after we've covered two other steps that are
  involved in preparing programs.