Commands that run in the *MASTER* or CONSOLE address space are divided into six command classes. In each class, only 50 commands can execute at one time. Any additional commands in that class must wait for execution.
To manage the number of commands that are awaiting execution, the system operator can issue the CMDS command to display the status of commands, remove selected commands that are awaiting execution, or cancel commands that are executing. When a command is removed before execution, the command issuer receives message IEE065I COMMAND NOT EXECUTED, CMD=command instead of the usual command response message. When a command is canceled, the command is terminated with an ABEND code 422, reason code 00010301.