"<meta http-equiv=\"refresh\" content=\"0;URL='/" + @WebDbName + "'\" />"
To recap: If a browser tried to hack your URL by guessing the name of a real view (ex. http://www/acme.com/db.nsf/all), Domino will try to use the default view template to display the view, but the META refresh will redirect the user back to the base URL of the NSF, which will force it to use the application’s launch property to take the user where you want them to be.
If the view name they try is not a real view in your database, they’ll get a different error that the design element does not exist. So, it might be a good idea also create a $$ReturnGeneralError FORM from a copy of the $$ViewTemplateDefault.