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(widget)Utilities

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Utilities.
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 - Function: widget-prompt-value widget prompt [ value unbound ]
     Prompt for a value matching WIDGET, using PROMPT.  The current
     value is assumed to be VALUE, unless UNBOUND is non-nil.

 - Function: widget-get-sibling widget
     Get the item which WIDGET is assumed to toggle.  This is only
     meaningful for radio buttons or checkboxes in a list.