This allows you to put active tutorials or other resources right into the page instead of relying on links.
Find the URL of the site you're embedding, and paste it in. The width in the code below is defaulted to show as wide as possible (100%); you can also define a pixel width instead of a relative width. The height is an example of pixel-size rather than relative size; you can change the height to be whatever you want.
<iframe src="PASTE THE URL YOU WANT TO EMBED HERE" height="300" width="100%"><br /> <p>Your browser does not support iframes.</p><br /></iframe>