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▀ If the output device is busy, this function waits until the device is
  ready to accept a character.
 
▀ There is no way to poll the status of the auxiliary device using this
  function. On the IBM PC, more precise control can be obtained by cal-
  ling ROM BIOS Int 14H or by driving the communications controller
  directly.
 
▀ If a CTRL+C is detected at the keyboard, an Int 23H is executed.
 
▀ You can also send strings to the auxiliary device by performing a write
  (Int 21H Function 40H) using the predefined handle for the standard
  auxiliary device (0003H) or using a handle obtained by opening the
  logical device AUX.
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