An IFrame is a bit like a Frame only (in my opinion) easier.
This is the code for an Iframe
Change the position of the Iframe by changing the bit where it says top and left, the hight the number in top the nearer the bottom it is and the higher the number in left the further right it is.
Where it says URL put in the url you want to see in that iframe. Where it says NAME put a name for that iframe make sure each iframe you use has a different name.
Also you change the width and height by fiddling around with those numbers.
Linking is imporant because most people put there page list in one iframe and want there pages to appear in another this is how to do that;
change the url and where it says NAME put the name of the iframe you want that page to open up in.