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How can I make Labview detect a change in a control?

I would like a mathmatical equation to be solved every time that there is a change in one of the controls. I don't want it to be made until there is a change in the controls.

In other words if my two controls are 1+1+?, I don't want the ? to be answered until Labview detects a change of one of the numbers.
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It sounds like you need the event structure in LabVIEW 6.1 or later. Look in the LabVIEW user manual and the shipping examples.
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