ignore this question if its so naive question as it is BUT, I dont know which programming language they use, is it asp or php or aspx or others but what i often see is the html page extension...i was wondering if it is possible to know which programming language they use !
It is difficult to tell from the source as they use javascript events to fire up their own scripts. Possibly they have their own API (like much of their tools that they've released). A lot of the dynamic stuff (like Google Analytics) is done with a mixture of AJAX and Flash.