Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 5Ah
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  Interrupt:   21h     Function:   5Ah
 
  Title:       Create Temporary File [Version 3.0+]
 
  See also:    Create File, @MakeFile
 
  Description:
 
     Creates a file with a unique name, in the current or specified
     directory on the default or specified disk drive, and returns a
     handle that can be used by the program for subsequent access to
     the file. The name generated for the file is also returned in a
     buffer specified by the program.
 
     Input                                     Output
 
     AH = 5Ah                                  If function successful
     CX = Attribute (bits can be combined)       Carry flag: clear
                                                 AX = Handle
          Bits     Significance (if set)         DS:DX = segment:offset of
                                                         complete ASCIIZ
          0        Read-only                             path name
          1        Hidden
          2        System                      If function unsuccessful
          3-4      Reserved (0)                  Carry flag: set
          5        Archive                       AX = Error code (03h,
          6-15     Reserved (0)                       04h, or 05h)
                                                 See: ◄Error codes►
     DS:DX = segment:offset of ASCIIZ path
             name
                                    -♦-