qa.hlp (Table of Contents; Topic list)
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Int 21H Function 25H
   Summary  Notes  Example  Back
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▀ This function should be used in preference to direct editing of the
  interrupt vector table by well-behaved applications.
 
▀ Before an interrupt vector is modified, its original value should be
  obtained with Int 21H Function 35H and saved, so that it can be
  restored using this function before program termination.
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