"Tag" ? In what context?
I think if you get one, you're out.
Or it could mean if you get one, You're it.....So I can understand Mo's confusion ..........
It's keywords you can put in a thread to make it easier found if you are using "Mr Searchy"
I read up a little about it yesterday and it may be a decent SEO tool, but wanna do some more reading on it before I start messing with it myself