By the comments line you mean something like:
LabRat wonders if that's entirely sane... ?
If so simply type /me and then the text you want. The /me command will be translated into your nick when you hit enter.
I'm not sure what you mean by question four. Whether you're looking for common abbreviations used or if you need an explanation of the ones you've listed?
LabRat (hey, it's 2.30 and I was supposed to be going to bed when I found myself in here...I might work it out better in the morning
)
