Yes message server is connected.. and here is my situation..
Our place have 4 ordering waiter and 2 delivery waiter.. the chance for ordering waiter to meet kitchen worker or delivery waiter is very low in rush hour (sat night between 8-11 pm).
We selling juice and we live in island... sometimes we cannot buy fruit in bulk on market because market got no stock... so we can only buy for small portion.
In rush hour many times we make a quest dissapoint because they order the X juice but the X juice didnt come for a long time (out of order) and the ordering waiter didnt know that X juice is no more stock.
And after we told to quest its no more avaiable, the quest dissapointed cause why we didnt tell to quest from begining..
So if i can create button in 1 click on kitchen pc and show message to all waiter tablet, it'll be helping a lot.