Normally, when a [JSup Code|code] or an [JSup Animations|animation] is listing for value changes of a [JSup tag|tag], it is not guaranteed that all values that the [JSup tag|tag] assumes are viewed by those listener.

When a [JSup tag|tag] changes its value (to 1, for example) an event is posted to all listener, but the [JSup tag|tag] value could change its value again (and becomes 2, for example) before the 1 value was seen by the listeners.

A mailbox [JSup tag|tag] is guaranteed that lets all the listener to view (and process) all its values, even through [JSup execution modes|clients/server] communication.

The mailbox dispatch mode is useful if you need to post some values via a [JSup tag|tag] and you want the listener [JSup Code|code(s)] to view and process all posted values, even for very closely posts.