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  Overview
    How Device Drivers Work

  The ANSI Driver
    ANSI Screen Control
    ANSI Keyboard Control
    The Pros and Cons of the ANSI Driver

  Two features introduced with DOS version 2.0 require special discussion:
  installable device drivers and the ANSI driver (ANSI.SYS). Although these
  features are related by their common introduction in DOS version 2.0 (and
  by the fact that the ANSI driver is itself an installable device driver),
  they are radically different topics from a programming perspective. We'll
  begin by looking at device drivers in general, give you some details about
  how DOS device drivers are implemented, and then review how a typical DOS
  device driver, ANSI.SYS, can be used in DOS applications.