Commands that should work in all chat enviroments; Java and IRC
/msg {nickname} = Sends a private message to the person who's nick you typed in.
/whois {nickname} = Displays various info about that person; IP address, where they are, Chat Client, etc
/help = Usually brings up a list of Commands in the chat window
/join {#channel} = Takes you to the specified room.
/me {actiontext} = Prints your nickname with the action text afterwords; for example /me throws Johnny248 in da river of life would say, TWJOlson throws Johnny248 in da river of life
/whereis {nickname} = Tells you where that person is if they are logged on.
/ignore {nickname} = blocks all incoming messages from that person
/unignore {nickname} = Allows messages to be recieved by this person again
/leave {#channel} = Leave the named room
/whowas {nickname} = Shows information for someone who just left IRC or Changed their nickname; shows the same info as the /whois command
/who {#channel} = Lists Nicknames, addresses, and other user info in that channel
/query {nickname} {message} = Opens a private chat with that person
/nick {new nickname} = Changes your nickname to whatever you want.
/away {away reason} = Marks you as away; that you aren't at your computer
/away = Brings you back from away mode set above
/list = Retrieves a list of channels on the server
/mode {nickname} +i = Puts you in invisible mode; people can't get your info by /who and /names commands; however they can use a /whois command to get it
/ctcp {nickname} ping = Sends a signal to that person and times how long it takes to get back
/ctcp {nickname} version = Returns the program and version that they are using to chat
/ctcp {nickname} time = Shows you the their local time
/dcc chat {nickname} = Opens a Direct Client-to-Client connection with that person; the most secure means of chatting one-on-one
/dcc send {nickname} {C:\path\to\file.exe} = Request to send a file to specified person
/dcc close {nickname} = Closes a DCC connection (chat, file transfer, etc) with that person
/mode {#channel} +o {nickname} = Grant Ops status to that person
/mode {#channel} -o {nickname} = Takes away Ops status
/mode {#channel} +b {!address} = Bans the person from the channel
/mode {#channel} +s = Makes the channel a secret; will not be published on the channel list
/mode {#channel} +k {keyword} = Makes the channel password protected; to enter people must enter /join {#channel} {keyword}
/ = Recalls last thing said in current window.
/action {action text} = Sends a message describing what you are doing; same as the /me command
/clear = wipes all text from the current chat window
/font = Brings up the font selection dialog boxes; allowing you to change text color, size, and font face.
/exit = Forces mIRC to shutdown and exit
/help = Opens mIRC's Help File
/channel = Opens the Channel Dialog box; allowing you to change rooms.
/quit {reason} = Disconnects from server with a good-bye message before you go
/time = Shows the time at the server; not local time though
/timestamp {on|off} = Posts the time a message was sent before each persons name
/ping {nickname} = Pings that persons computer; sends a signal to them and measures how long it took to get back
/amsg {message} = Sends the message to all channels you currently are in
/ame {action text} = Same as /me but sends the action to all channels you are in
/clipboard [-a] {text} = Pastes the text to the clipboard; you can leave out the -a or put it in and have the text be appended to the clipboard.