图标“聊天系统”网络应用的机制

Let me set this up. I work in sound / multimedia at a medium-sized church. There are times when the platform needs to communicate with either the sound room or the multimedia room, and we don't want to be obvious about it. We've tried walkie talkies, but, frankly, we run things pretty hot, and we can't hear the talkies, even with earbuds. Also, we can't use texting; it's just too slow.Let me set this up. I work in sound / multimedi