Not sure what the difference is, but it older threads do not all have t.
Replacing the T with a P in the link you gave as an example of a T thread gave me this thread: http://forum.toribash.com/showthread.php?p=43303 which is even older.
is it really that simple?
I think it is that simple.
Imma close this for now, if anyone has a different answer PM me or just open it yourself if you have the perms