mendix application url issue

hi team , how i can use "Set URL" widget ? Please give me the proper steps how i can use this widget . Also . I have a query regarding url  in my mendix application , user login and after that home page is showing . If  user copy this home page url and paste and hit on other browser . Than my login screen is not visible .  so how i can implement that if url is not valid than login screen should visible . Please give the proper steps it will be helpfull. Thanks  
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