These commands send notices to various users. Locops will send a notice to every oper on the server. Globops will send a notice to every network operator who is +g, regardless of which servers they are on. Server will send a notice to everyone on the server. Network will send a notice to everyone on the network.
/as util network -=This is a global notice=- Our chat network is celebrating its first birthday, join #Administration for cake!
These notices can be particularly useful if you create a script that is disruptive in some way. Noticing first allows people to prepare.