Using transclusion as an argument for a Mediawiki Extension

Question

I'm currently developing an extension to mediawiki for a class at my college.

I'm tailoring a tabbed box for use on the main page, so we can categorize the portals within the wiki.

I would like to use transclusion as an argument for my extension so that I may be able to get a remote page's contents to update within the html of tabbed box.

So for example, I would like to do the following:

{{General}} {{Updates}} {{Assignments}}

which would, of course, reference Template:General, Template:Updates, Template:Assignments pages.

Is this possible? What is the best way to approach this?

I know I am being not too descriptive, but I can give any additional information that is required. I appreciate the help. Thanks.