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
Parallel Directive Clause: Specifies that the task is never tied to the thread that started its execution.
UNTIED
Any thread in the team can resume the task region after a suspension. For example, during runtime, the execution of a given task can start on thread A, break execution, and later resume on thread B.