REWIND

 Positions a sequential or direct access file at the beginning of
 the file.  Do not use a REWIND statement for a file that is open
 for indexed access.  Use this statement only for files on disk or
 magnetic tape.  Statement format:

     REWIND ([UNIT=]u[,ERR=s][,IOSTAT=ios])
     REWIND u

     u    Is an integer variable or constant specifying the 
          logical unit number of the file, optionally prefaced 
          by UNIT=.  UNIT= is required if unit is not the first 
          I/O specifier.

     s    Is the label of a statement to which control is 
          transferred if an error occurs, prefaced by ERR=.

     ios  Is an integer variable to which the completion status 
          of the I/O operation is returned, prefaced by IOSTAT=.

 The unit number must refer to a file on disk or magnetic tape, and
 the file must be open for sequential, direct, or append access.

 If a REWIND is done on a direct access file, the NEXTREC specifier
 is assigned a value of 1.

 A REWIND statement must not be specified for a file that is open
 for keyed access.

 If a file is already positioned at the initial point, a REWIND
 statement has no effect.

 If a REWIND statement is specified for a unit that is not open, it
 has no effect.

 See also STATEMENTS BACKSPACE in this Help file.