Is it possible to implement the functionality of a desktop program in the WEB?

Question

JavaScript

There is a desktop program “Bot for the site ***”
I load the proxy list, the list of VKontakte accounts into the program. When you press the “Start” button, the program in multi-threaded mode begins to perform tasks on the site ***.
Is it possible to implement this functionality in WEB? And what is the easiest way to do this?
If the functionality is not clear, ask a leading question so that I can answer more correctly.

Answer 1

I load the list of proxies, the list of VKontakte accounts into the program. When you press the “Start” button, the program in multi-threaded mode begins to perform tasks on the site ***.

So, the program should have the following characteristics:
Of course, there are no obstacles for a web service to have all the listed characteristics. Absolutely any language is suitable for these purposes, so it's "easier" to do it in the one you know.

Answer 2

As an option node.js + nw.js

Answer 3

Absolutely yes!
I remember I met sencha.js on which gnome was implemented as an example, but it was paid.