milkhead

I am trying to pass cookies to an iframe for internet explorer and I did some research and found I need to use a header file and use this:

<?php
header('p3p: CP="NOI ADM DEV PSAi COM NAV OUR OTR STP IND DEM"');
?>

but my question is how do write the header file? Then where do I put this part below:

<?php
header('p3p: CP="NOI ADM DEV PSAi COM NAV OUR OTR STP IND DEM"');
?>

For example do I put it in the head tag, body tag, inside the iframe and etc and does the page that contains content have to be a php file?

So my main question is can some write the header.php code for

<?php
header('p3p: CP="NOI ADM DEV PSAi COM NAV OUR OTR STP IND DEM"');
?>

and then tell me where i need to put this part

<?php
header('p3p: CP="NOI ADM DEV PSAi COM NAV OUR OTR STP IND DEM"');
?>

Thank you for everyone's time and I look forward to anyone's reply, good day to all.