in a terminal/at a console (prompt) displays some text manuals about the command, and it's options etc. Almost all apps have man pages, and almost all flavours/distributions of Linux have the man program to show them.
If I were in Linux atm (*shock horror!*) I could read what L0 meant, but atm, try this
I had problems with my winmodem, a broken default firewall, and dual booting, but once you get past the setup, everything is sweet. Keep at it.