BrowserSetText will not work for a BODY element
BrowserSetText will only set text for text fields (INPUT). Sometimes parts of an application are actually a BODY element and cannot be controlled with BrowserSetText. In such instances, the BrowserTypeKeys function needs to be used instead.
For example, the main Comment Form in the screenshot below (http://demo.borland.com/samples/explorer.html#advancedforms) is a BODY element and cannot be set with BrowserSetText.
For further help or information please see the Silk Performer Help section for 'BrowserSetText Function' which states "This function can be used to set the text of a text field or text area element. The BrowserSetTextfunction applies to the HTML elements<input type='text'>and<textarea>."