this confused me greatly too at the start
you get used to frequent posters and their style (or lack of)
another tip if you are scratching your head but think you might know who it is =
say i make a post and you are intelligent/awake enough to reply or remember what thread. i then make another post with a different name. if you suspect this im
poster is me..you find a thread/post that you
know i definately made and you will see the im
posters name and know it was me