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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _dosexterr function obtains the extended error information
     returned by the DOS system call 0x59 and stores the values in the
     structure pointed to by <errorinfo>. This function is useful when
     making system calls with DOS versions 3.0 or later, which offer
     extended error handling.
 
     The structure type _DOSERROR is defined in DOS.H.
 
     Giving a NULL pointer argument causes _dosexterr to return the
     value in AX without filling in the structure fields.
 
     Return Value
 
     The _dosexterr function returns the value in the AX register
     (identical to the value in the exterror structure field).
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