The Friend Unifying Platform can connect to almost any digital device, and therefore it is impossible to predict all possible ways that developers, software and service providers, and users will resort to in the future. So it can be said for today that there are no limits!
This is true. There's a reason why operating systems like Linux, BSD, Windows and MacOS drives development of software and not simply web servers and browsers. Web servers and browsers also rely on operating systems to do hard work. This is why we thought it would be a good idea to have a full stack operating system - albeit on a higher level than "traditional operating systems". And Friend being high-level should not fool you. Since the 70s, engineers argued (read about the Thoth OS) that an OS ought to be majority high-level code for portability and universality - keeping its kernel close to the iron. Friend's kernel, of course, is written in C.
By using Friend's module system, developers can leverage any programming language to build their server side components - just like they do with Apache. But as a Friend module, they get access to cloud storage, network processing and a range of other functionalities built-in.