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/usr/share/irssi/help/away is in irssi 1.0.5-1ubuntu4.

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%9Syntax:%9

AWAY %|[-one | -all] [<reason>]

%9Parameters:%9

   -one:    Marks yourself as away on the active server.
   -all:    Marks yourself as away on all the servers you are connected to.

   Your away message; if no argument is given, your away status will be removed.

%9Description:%9

    Marks yourself as 'away'; this method is used to inform people that you
    are not paying attention to your screen.

    You might use it when you are taking a nap, in the shower, getting some
    food, or otherwise engaged. When you're 'away' you will see '(zZzZ)' in
    your statusbar.

    Anyone who does a WHOIS on your nickname will see that you are away, as
    well as your away message.

%9Examples:%9

    /AWAY
    /AWAY I'm getting some food.
    /AWAY zZzZ
    /AWAY -one Feeding the cat!

%9See also:%9 DISCONNECT