Would an English-speaking but non-technical audience be familiar with the terms URL (in the sense of link, web address) and GUI (Graphical User Interface), for example in a manual aimed at end users?
If not, are there alternatives to GUI for referring to "the part of the program you can see and interact with, including content, menus, buttons etc."?
Or is it perhaps better to just refer to a GUI as "the program", since there is no visible distinction between the program and the GUI for the person using it?