You could create a backend view, another backend page or section from where you could set the value that a given control will display. The steps that you should follow are listed below
1. Create a page or view which will be used to set the public control values - for instance RadEditor with a Button and a DropDown that will be used to specify which page you want to modify.
2. When the button is clicked you need to get the Page( you should use CmsManager - GetPage method) and the RadEditor content ( the RadEditor control has a property - Content). When you find this page, loop through the controls collection, find your control and set its content value. You can find sample code here - Finding Controls
and Modifying Controls
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