CL Programming
This introduction describes several major concepts of Operating System/400*
(OS/400*). These concepts are discussed in more detail in the following
chapters.
System operation is controlled by the following:
- CL commands. CL commands are used singly in batch and interactive
jobs, (such as from the Command Entry display) and in CL programs and
procedures.
- Menu options. System operation can be controlled by selecting menu
options. Interactive users can use the iSeries server menus to perform
many system tasks.
- System messages. System messages are used to communicate between
programs and procedures and to communicate between programs and procedures and
users. Messages can report both status information and error
conditions.
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