- stop conn thingprocedure
Immediately stop outputting the current message (whatever it is -- text, letter, key, or sound icon) from the identified client, if any is being output. If thing is self, the last message from the current client connection is stopped. If it is all, stop currently output message or messages from all the clients. Otherwise, argument id must be given as a positive integer and the currently processed message from the client connection identified by id is stopped; if there is none such, do nothing.