IRchat trys to emulate irssi (http://irssi.org) style whispers and opens a box containing a tab for each person whispering you.
For class color support you need teknicolor installed.
Can be moved by alt-dragging the bar at the top, can be resized using alt-drag on the drag box.
commands (type into the edit box on the frame)
:q (Closes the current window or the whole frame if its the last window)
:w player [message] (Open a new window to a the player, if a message is specified then the whisper is send)
:o id (Opens the window with ID id)
:help color (For setting colors)