The CMS Command Loop
When CMS is ready for you to enter a command, it is in what is called a command loop. To invoke a command, type the name of the command, module, or exec and press enter. CMS calls the CMS routines that locate and transfer control to the module or exec representing the command. When the command completes, CMS returns control to the command loop and displays a ready message (Ready;). The point where CMS returns control is called end-of-command. The command loop cycle continues as long as you enter commands.