Everything is possible with C++, but just not with SFML directly. 
You'd need to look into some OS specific coding I guess. Depending on what you want to achieve there might be tools that could simplify things dramatically.
I've always wanted to be able to expand the MS Windows clipboard functionality to be able to copy from and paste into more then one clipboard, all accessible from the mouse and ctrl+c/v.
My goal is to be able to draw 2 boxes next to the mouse when the ctrl+c hotkey is pressed and held and allow the user to move the mouse to either box and place their clipboard. It looks like the event/mouse and graphics systems of SFML can achieve part of this challenge, but I'm not sure about the window system and haven't dug deep enough yet.
It would be cool to make this cross-platform, but knowing it's probably a simpler task, focusing on Microsoft Windows (i.e. 8 ) in SFML is my target OS to start.
My long-term goal with SFML is actually to make games, but right now that above task is something I've always wanted to achieve in c++ but haven't been able to in it's entirety... only parts at a time (i.e clipboard management from a console - which is not complete/ideal for what I want). I figured it would be a good chance to learn some SFML too. I was already playing with some of the mouse [and other] functions - pretty easy!
PS - Thanks for the quick reply ^^
