Most of IRCD's including unreal which I am myself using, support away mechanisms, where user set themselves away using raw AWAY (with parameters to set away without to unset).
Problem here is: what is a most efficient way from client point of view to figure out that someone became away / removed away message.
Right now the way I solve this is that when you execute WHO <channel name> results similar to:
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(Tue Dec 8 13:18:33 2015) WHO: petan #support grumpy petan.staff.tm-irc.org hub.tm-irc.org petan Hr: 0 GrumpyIRC
(Tue Dec 8 13:18:33 2015) WHO: petan #support wm-bot wikimedia-bot.services.tm-irc.org hub.tm-irc.org wm-bot Hr+: 0 wm-bot
(Tue Dec 8 13:18:33 2015) WHO: petan #support sid129243 steinsplitter.irc hub.tm-irc.org Steinsplitter Hr: 0 Steinsplitter
(Tue Dec 8 13:18:33 2015) WHO: petan #support operbot bot.tm-irc.org hidden OperBot H*&: 0 Operations Bot
I also know that when you message user who is away you usually receive a message from server:
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(Tue Dec 8 13:20:25 2015) :hub.tm-irc.org 301 petan petan :I am currently not here
Is there any better way? This may be off-topic here, but I couldn't find any other section that would fit better. Nor I know about any general place where IRC standards can be discussed.