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This is a field which can be used for a single choice, or multiple choices , from a list. The value property determines what selected option value will be populated in the field when the program gets the screen input. When the program outputs to the screen, it attempts to match what is in the 'value' field to an option in the select box. If no match is present the first options is selected. The list of choices can be loaded in a variety of ways, please see below for more detail.
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