You can verify someone as being a Network Official via : /msg X verify nickname-here. The display will result in Channel Services Staff (Administrators and Official Representatives) or/and Channel Services Coder or/and Irc Operator. Altough it's not mandatory to have one of the functions to have the other, there are some persons who cumulate 2 (i.e Administrator or Official Rep and Irc Operator) due to the nature of their tasks and trust from a Server Administrator.
Additionally Global Irc Operators have a distinctive mark on their /whois ---> "is an Irc Operator" even if not authed with their X username (CService Staff require auth'ing to X to reply to /msg x verify nickname-here for a positive result of their global status). Moreover CService staff usually hangs out in #CService assisting regularly our guests so you can always drop by and state your doubts.