/INPUT_ONLY can be used with SPY to skip watching terminal output and
   instead watch only the user's input keystrokes.

   The /DISPLAY_TYPE qualifier allows you to chose the format in which
   control characters are displayed during input-only watching or logging.

   Your site must be licensed to use input-only and any watcher and the user
   being watched must have been authorized by the system manager for
   input-only watching since passwords and other non-echoed input are
   displayed during input watching.

   Rights-list Identifiers are used to specify who may watch, or be watched,
   with /INPUT_ONLY. The Rights-list Identifiers used are
   SPY$INPUT_WATCHER and SPY$INPUT_WATCHEE.

   Any user using the input-watching feature to watch another with SPY
   must have been granted the Rights-list Identifier SPY$INPUT_WATCHER.

   Any user who is going to be watched /INPUT_ONLY with SPY must have been
   granted the Rights-list Identifier SPY$INPUT_WATCHEE.

   For help on /INPUT_ONLY watching, see the top-level PEEK Subtopic:
   Watching /INPUT_ONLY.

   INPUT_ONLY terminal-logging is done using NDC's KeyCapture product.