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  Include:   <fcntl.h>, <io.h>, <sys\types.h>, <sys\stat.h>
 
  Syntax:    int open( char *filename, int oflag[, int pmode ] );
             oflag: O_APPEND, O_BINARY, O_CREAT, O_EXCL, O_RDONLY,
                    O_RDWR, O_TEXT, O_TRUNC, O_WRONLY
                    (may be joined by |)
             pmode: S_IWRITE, S_IREAD, S_IREAD | S_IWRITE
 
  Returns:   a handle if successful, or -1 if not.
             errno:  EACCES, EEXIST, EINVAL, EMFILE, ENOENT
 
  See also:  access, chmod, close, creat, dup, dup2, fopen, sopen,
             umask
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