The Compose bar allows you to complete a command or a message before sending it to the remote computer. It can be useful when you are in a chat room or enter the same command repeatedly. The Compose bar remembers all messages entered while Xshell is running and you can select one in the list. Also, by using the Compose bar, you can send a same message to all active sessions simultaneously. When Xshell exits, all the messages are discarded permanently.