@everest
Without an iframe there is no way to reliably support a back button. The issue arises when a user saves the webapp to the homescreen and then launches it (i.e., iOS webapp mode). In webapp mode, the app does not have the traditional browser button bar with back button. So if the webapp navigates to a remote website he will be stranded there if that site does not provide a back button.
It is very simple to create an app and try it.
1) Simple create a new app add a button. In the button’s link property enter the url you want to navigate to when clicked. e.g., http://genuitec.com.
2) Be sure the Test Center is in “Strict webapp mode” (Browser menu>Strict webapp mode) before you run the webapp.
3) Run the app in the Test Center.
4) In the Test Center, save the webapp to the homescreen.
5 Relaunch the app from the homescreen and click the button.
-The remote URL should load. Can you nav back to your app from the remote site?