## 10.6.24 USEROPEN Keyword

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

    USEROPEN = function-name

function-name
  Is the symbolic name of the user-written function.

The function name must be declared EXTERNAL, and if it has a data type, it must be INTEGER*4.

With USEROPEN, knowledgeable users can employ additional features of the operating system that are not directly available from Fortran, while retaining the convenience of writing programs in Fortran.

For More Information:

For more details on USEROPEN, see your user manual.

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