Board Thread:Questions and Answers/@comment-92.26.175.168-20121213205916/@comment-5796218-20121227023916

NEI functions differently in SMP than single-player. In single-player you are an operator-level user by default and have full access to all parts of NEI (weather control, item cheats, daylight control, etc) but in SMP you will only see these if you are a server OP.