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Indicates that a subVI or section of a diagram is running for the first time.

You can place the First Call? node in multiple locations within a VI. The node returns TRUE the first time the section of the diagram in which it is placed runs.

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First Call?

A Boolean that returns whether the subVI is running for the first time since you ran the entire VI.

TRUE This is the first time the subVI is running since you ran the entire VI.
FALSE This is not the first time the subVI is running since you ran the entire VI.