Available HELP topics (some of them are only accessible to IRC operators):

ACCEPT          ADMIN           AWAY            CAPAB
CHALLENGE       CLOSE           CMODE           CONNECT
DIE             DLINE           EOB             ERROR
ETRACE          GLINE           GUNGLINE        HASH
HELP            INFO            INVITE          ISON
JOIN            KICK            KILL            KLINE
KNOCK           LINKS           LIST            LOCOPS
LUSERS          MAP             MODULE          MOTD
NAMES           NICK            NOTICE          OPER
OPERWALL        PART            PASS            PING
PONG            POST            PRIVMSG         QUIT
REHASH          RESTART         RESV            SERVER
SET             SJOIN           SQUIT           STATS
SVINFO          TIME            TOPIC           TRACE
UMODE           UNDLINE         UNKLINE         UNRESV
UNXLINE         USER            USERHOST        VERSION
WALLOPS         WHO             WHOIS           WHOWAS
XLINE