The SDK documents this as: :FORM_INTERFACE (INT type) — when assigned a value of 1, indicates that form records are filled by a form load interface rather than the user.
What does this mean in practice? First of all, the variable has to be placed in a form trigger for it to take action. When data is entered into a form via an interface, the given trigger will not execute if the variable has the value 1. I had a case (that I don't remember now) where an interface would enter data, but some value was missing (deliberately) and this would cause a trigger in the target form to execute, saying that a field required a value. I had to invent some arcane mechanism in order to prevent this error, but it would have been much simpler had I known about (or remembered) this variable.
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