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2 definitions found
 for ill-behaved
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  ill-behaved
   adj.
  
      1. [numerical analysis] Said of an algorithm or computational method that
      tends to blow up because of accumulated roundoff error or poor convergence
      properties.
  
      2. [obs.] Software that bypasses the defined OS interfaces to do things
      (like screen, keyboard, and disk I/O) itself, often in a way that depends
      on the hardware of the machine it is running on or which is nonportable or
      incompatible with other pieces of software. In the MS-DOS world, there was
      a folk theorem (nearly true) to the effect that (owing to gross
      inadequacies and performance penalties in the OS interface) all interesting
      applications were ill-behaved. See also bare metal. Oppose well-behaved
      . See also mess-dos.
  
      3. In modern usage, a program is called ill-behaved if it uses interfaces
      to the OS or other programs that are private, undocumented, or grossly
      non-portable. Another way to be ill-behaved is to use headers or files that
      are theoretically private to another application.
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  ill-behaved
  
     1. [numerical analysis] Said of an algorithm or
     computational method that tends to blow up because of
     accumulated roundoff error or poor convergence properties.
  
     2. Software that bypasses the defined operating system
     interfaces to do things (like screen, keyboard, and disk I/O)
     itself, often in a way that depends on the hardware of the
     machine it is running on or which is nonportable or
     incompatible with other pieces of software.
  
     IBM+PC/{mess-dos">In the IBM PC/{mess-dos world, there is a folk theorem
     (nearly true) to the effect that (owing to gross inadequacies
     and performance penalties in the OS interface) all interesting
     applications are ill-behaved.
  
     See also bare metal. Opposite: well-behaved, compare
     PC-ism.
  
     [{Jargon File]
  

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