When you say page I think pagenode and then I think no but you can use it with the raw html like this in the page html from the ACP....
HTML:
<iframe src="http://www.INESERT.com/of/your/choice-here" class="ChangeThisClassName" height="700px" width="700px" frameborder="0" scrolling="no">
<p>Get a newer browser if you can see this</p>
</iframe>
As a bbcode actually to be used in the forum nodes I think there is a bbcode in the bbcode repository of definitions for King Kovifor's Bbcode manager
So that worked but its got some strange issue?
The page is stuck on the Left Half is there any way to fix this and allow it to fill the entire page? http://theocraft.org/pages/Test/
Code:
<iframe src="http://theocraft.org" class="site" height="700px" width"1200px" frameborder="0" scrolling="yes">
<p>Get a newer browser if you can see this</p>
</iframe>
<iframe width="938px" scrolling="yes" height="700px" frameborder="0" class="homeiFrame" src="http://theocraft.org">
<p>Get a newer browser if you can see this</p>
</iframe>