インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス
The SHARED specifier indicates that the file is connected for shared access by more than one program executing simultaneously. It takes the following form:
SHARED
On Linux* and macOS* systems, shared access is the default for the Fortran I/O system. On Windows* systems, it is the default if SHARED or compiler option fpscomp general is specified.