Burp Proxy is an interactive HTTP/S proxy server for attacking and testing web applications. It operates as a man-in-the-middle between the end browser and the target web server, and allows the user to intercept, inspect and modify the raw traffic passing in both directions.
In emacs you use the function “occur” to find all occurrences of a string (or regexp) in a buffer. The matching lines are listed in another buffer named “*Occur*”, and you can click them there to navigate to the corresponding lines in the original buffer. That is, buffer ‘*Occur*’ acts as a hypertext index to your buffer.