pick out the template on a page

[Wordplay]

is it possible to get the complete template of a page, just by browsing the page?

for example, if you're viewing a thread, is it possible for anybody to get the complete code of the postbit template?

that shouldn't be possible right? even looking at the source, all the codes such as:
member.php?$session[sessionurl]u=$bbuserinfo[userid]
should be rephrased anyways. so is there some other way to get a complete template of a page?