Be careful when entering commands without waiting for the intervening mode messages. If you make a mistake in one of the commands, the system sends you one or more messages, and then cancels the remaining commands you entered. After you correct the error, you have to reenter the other commands. Therefore, unless you are sure your input is correct, wait for a READY message before entering a new command.

Some terminals lock the keyboard after you enter a command, so that when you press the keys, you are not communicating with the system. You cannot enter commands until you get a READY message. Terminals that do not normally lock the keyboard might occasionally do so, for example, when all buffers allocated to the terminal are full. See your terminal operator's guide for information about the terminal you use.