You seem to be trying to jump in the water before you know how to swim....
1) People make landing pages many ways, prob the best way is using creative suite (photoshop, dreamweaver, etc) and iframes are when u frame one page inside another.
2) A DMR is a way of blanking the referer.
But really why not just go to google, type in iframe and read what it is. And if you just typed double meta refresh into the search here on BHW there are LOTS of answers and even some DMR codes to use. Come on man, make more of an effort, really.