/WhoIs requests info about a given list of users. If the server is given, that specific server will be asked. If the user is on that server, you may get even more information (like idle time).
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/WhoIs Gerph
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would probably display :
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\* Gerph is gerph@gerph.winsley.org \* (Justin Fletcher)
\* Gerph is on via gerph.winsley.org: RISC OS IRServer, Gerph's house