Wheews, it's been awhile since i've posted and I know most likely I should just search this question but I haven't found the answer yet and i don't feel like searching too long so i've decided to just ask you guys...

I remember the question i asked before about the concepts of vtec in which i was rerouted to the Why stuff works website...after reading that and talking to people at school i understand the basic concepts of it now...

but the popularity of RSX's at my school has brought up the subject of Ivtec... the only thing i really know about it, well i hope, is that the DOHC are controlled by computer rather than just the cam profile???? I'm just curious about it and my class doesn't teach Cams in depth like that...