Why does a post have to be at least ten characters long? Sometimes I just want to say "thanks" or "right."

And while I'm asking, I can understand why the spoftware is programmed not to allow all capital letters (it's annoying to read), but would it be possible to allow, say, ten caps in a row so I could write GREAT?

(GREAT worked this time, but earlier I tried to post a two word reply in all caps and it was reduced to lower case)