## 13.6.31 USEROPEN Specifier

The USEROPEN specifier indicates a user-written external function that controls the opening of the file. It takes the following form:

  USEROPEN = function-name
  function-name
  Is the name of the user-written function to receive control.

  The function must be declared in a previous EXTERNAL statement; if it is typed, it must be of type INTEGER(4) (INTEGER*4).

The USEROPEN specifier lets experienced users use additional features of the operating system that are not normally available in Fortran.

For More Information:

For details on user-supplied functions to use with USEROPEN, including examples, see your user manual or programmer's guide.

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