This is how I've set it up.<br><br>First, I have a theme that is just blank, with the words area set to be at 0px and 0px both x and y, and with the area set to the same size as the screen (in my case, 1024x768).<br><br>Then, a formatting tag is there - I've given it the tag 'web' - with the following code as the front part:
<iframe src="
and this at the end part:
" height="100%" width="100%">This content cannot be displayed</iframe>
(Note that the 'src' part is split over the two tags!).<br><br>Then, using a Custom Slide, set the theme for the slide to be the full screen one set up, and in the content write {web}http://mywebsite.com{/web}, then when you load that slide, the webpage will load up.<br>