An emulator program is used to make your PC act like an IBM 3270 display terminal. This also releases the job from the output queue. The time needed to process a job can vary greatly. JCL statements can be very complex. You will need to be careful when coding.
NAME is sometimes optional.
The first character must not be numeric. They vary greatly depending on the statement type. Usually, there is not enough room remaining on the statement for a meaningful comment. Most programmers code JCL comment statements instead. The remainder of the statement is treated as a comment.