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  Description:  Set Current Directory
 
  Sets the current, or default, directory using the specified drive and
  path.
 
  Input                                     Output
  ══════════════════════════════            ══════════════════════════════
  AH=3BH                                    If function successful
  DS:DX=segment:offset of ASCIIZ            Carry flag=clear
        pathname                            If function unsuccessful
                                            Carry flag= set
                                            AX=error code
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