How to see behind the ui

Answer 1

For desktop applications
https://www.quora.com/How-can-I-crack-a-exe-application-file-and-get-its-source-code

For website
https://www.computerhope.com/issues/ch000746.htm
https://www.google.com/amp/s/neilpatel.com/blog/how-to-read-source-code/amp/

Answer 2

I’m not sure what you are asking. You want to see source code for what type of interface? web? mobile? PC? Mac? If you clarify, I can answer you.