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  Description:  Critical-Error Handler Address
 
  The machine interrupt vector for Int 24H (memory locations 0000:0090H
  through 0000:0093H) contains the address of the routine that receives
  control when a critical error (usually a hardware error) is detected.
  This address is also copied into locations 12H through 15H of the pro-
  gram segment prefix (PSP) when a program is loaded but before it begins
  executing, and is restored from the PSP (in case it was modified by the
  application) as part of MS-DOS's termination handling.
 
  This interrupt should never be issued directly.
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