BuddyPress.org

thanks to both, something new is always highly appreciated. as I am new in php, question is not very important, simple interest of what happends in this area.
what I understand from firebug work is that it shows where (css file) css id of particular site’s area is located. comparing to what mercime wrote, as I understand, easiest solution for beginners is to rename style.css and make several renamed clones of it with incorrect info, what will make thief at least to think which code to use.
never use described method, this is just imagination