Some clients implement a command like
/amsg <message>, which sends that message to all active tabs (both channels and private queries). This can get really spammy, so the module will allow the first message to go through and block the others for a short period of time. It will also strip colours and control codes, in case some people have edgy scripts for different markup across tabs. The offender will get an in-channel notice if the target is a channel and in the server console if otherwise.