Answer: irc

AnswerCrossword Clue
IRCInter-office communicator, often
IRCThe law for U.S. taxpayers (abbr.)
IRCThe law for US taxpayers (abbr.)
IRCCPA's expertise
IRCMilitary group: Abbr.
IRCSource of some bash.org material
IRCInitials for web chatters
IRCTalking on the Web letters