Your usual nick — a new tab or browser window will connect straight away with this instead of asking every time.
Click the ticker bar itself to hide or show it again.
Totally optional — but registering means nobody else can pick your name while you're away, and unlocks memos. Takes 10 seconds, no email needed.
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Leave a note for someone who's not around right now — they'll get it next time they sign in. Needs a registered nick (see the NickServ tab) so they know the memo's really from you.
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Smaller text fits more lines in the window — 14px is the default.
How much history each window (Status, channels, PMs) keeps before older lines drop off the top. 200 is the default.