/whowho would be an IRCd command... /msg nickserv whowho would be a services cmd
some ircd already have someting similar, /whowas
but this also has very little todo with anope imo.. it has nothing to do with nick/chan registration and most obviously since /whowas is already an ircd command, i would think /whowho would also be better off being handled by the ircd.
on most ircd's it s possible to write modules to add new commands (though i know very little about how to do it)...
[Edited on 30-3-2008 by Viper]