No Idea what TF stands for, but I assume you are searching for your post you mentioned.
I found this
http://sparxsystems.com/forums/smf/index.php/topic,30347.0.htmlwhich goes somehow I this direction.
How did I find that?
In seach “By user" I added “qwerty” and in "Serach for" I added “to” (just because of, I need 2 characters for some reason and the word “to” is very common)
and Message age 1-50 (0-xxx will not work)
Ok! strange approach!