couple of questions

first of all - how does Integra control Alucard?(btw, the whole Arucard anagram really puzzled me, but once i realized he was Dracula, it was really incredible that such a mistake with the translation could occur, since all you'd need to do is spell it backwards)
why does Alucard obey anyone, and how the hell did he get himself in that cell (where Integra found him) in the first place?
also, i don't get the whole "nothing gets explained" point, so can anyone tell me who's creating the vampires/making the chips, what happens with the Vatican conflict and do Alucard and the Alexander Anderson character ever finish each other off? is that conflict tied to someone's ambitions or is it simply catholic vs protestant kind of thing? and how does the regenerator thing work (what are his limits, how did the guy become like that, can he die of old age, etc)?
last, but not least, can anyone actually kill Alucard? i mean, kill him for good. no coming back.