Has any one set up Templates inside their Wikipedia?
I like the "Wikipedia:Today's featured article" Template on the main Wikipedia page.
How'd they do it?

1st create a normal page, but name it something like
Template:Something
To test the process edit some text like "this is text from something"
save that edit

Now create or edit another page and add the call
{{Template:Something}}
or
{{Something}}

Now when the page is viewed the "this is text from something" appears