This command will send a notice to all of the room operators in the room. It will appear as if the primary room bot sent an opnotice. This is available in the Enterprise edition or with the Scribe module.
/as chan #chat opnotice Watch that user carefully, he has caused problems before.
There isn't much reason to send opnotices through the bot, but it can be useful in certain situations. If you really want to send an anonymous opnotice, then you can. However, even if you are not opped in the room you can still send an opnotice by using /notice @<room>