What is IRC and AccessIRC.Net?
IRC stands for Internet Relay Chat, it is a method of communicating with other people all around the world, AccessIRC.Net consists if several servers in different countries and is maintained by hobbyists
How do I connect?
First you will need an IRC client there are two popular ones, mIRC(http://www.mirc.com) and XChat(http://www.xchat.org), then you can connect by typing /server irc.accessirc.net
What is a channel and how do i join it?
A channel is like a room, to join one type /join #channel_name
All channel names start with a #(hash/gate)
How can I transfer files from other users?
First you will need to find a file sharing channel, then you will need to ask for instructions/help there