WHOIS [-<server tag>] [<server>] [<nicks>]
The server tag the target nickname is on.
The remote server to query and the nicknames; if no remote server is given, the server you are connected to will be used. If no nickname is given, you will query yourself.
Displays information about users in the specified channel; you may give the same nickname as the argument twice to also query the idle time.
If the nickname is not online, the WHOWAS command will be automatically performed.
/WHOIS /WHOIS mike /WHOIS ircsource.irssi.org bob /WHOIS sarah sarah