Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 24h
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  Interrupt:   21h     Function:   24h
 
  Title:       Set Relative-Record Number
 
  See also:    Set File Pointer
 
  Description:
 
     Sets the relative-record-number field of a file control block
     (FCB) to correspond to the current file position as recorded in
     the opened FCB.
 
     Input                          Output
 
     AH = 24h                       AL is destroyed (other registers
     DS:DX = segment:offset of      not affected)
             previously opened
             file control block     FCB relative-record field (offset
                                    21h) updated
                                    -♦-