void main(){
     object oPC = GetPCChatSpeaker();
     object oArea = GetArea(oPC);

    int bNoShout = GetLocalInt(oArea, "iNOCHAT");

    if(bNoShout){
         int nChatVolume = GetPCChatVolume();
         if(nChatVolume == TALKVOLUME_SHOUT){
             SetPCChatMessage();
             FloatingTextStringOnCreature("You cannot shout in this area.", oPC, FALSE);
         }
    }
}