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The assigned prefixes will show in the Form Outline. This is helpful when writing the rules for the second and third instances.

The rule shown populates the control named a in the second copy of the custom control with the word "sour" and the third copy with the text "sweet and sour" respectively whem the form loads. Notice the a controls in the second and third copies are referenced with the prefix in the rule.

if(form.load)
{
a.value='sweet';
}
if (C196a.value.length > 0) {
C196a.value = 'sour';
}
if (C198a.value.length > 0) {
C198a.value ='sweet and sour';
}

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