## 13.5.25 READWRITE Specifier

The READWRITE specifier asks whether a file can be both read and written to. It takes the following form:

  READWRITE = rdwr
  rdwr
  Is a scalar default character variable that is assigned one of the following values:

  'YES' | If the file can be both read and written to
  'NO' | If the file cannot be both read and written to
  'UNKNOWN' | If the processor cannot determine whether the file can be both read and written to

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