Java SE (Java Platform, Standard Edition)

Hi,

I have a question..maybe a dumb one , but can't find any relevant information, or i'm just using the wrong keywords in my search.

I've created an Applet that does a looot of things, and one of them is the possibility to load files inside a web repository.

What I do know that's possible, is to load the repository from the applet. My objective is create some button that loads a new page/tab with the webrepository's website showing the list of the files.
What I don't know if it's possible, is to create some action in my webrepository (like some button javascript, or in another language) that can send the content back to the applet. (for example, clicking a file that automatically opens back the tab with the applet, showing the contents of the file)

Can please someone help in this question?

Thanks!