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It is a program called QCMD (or Command Entry Display) and from it almost any 5250 application can be invoked in some direct or indirect way. However using QCMD is not acceptable to many sites for security reasons, so the rest of this material discusses various ways you might create your own specialized and some of issues and additional benefits that might arise.

How does an SJP work?

Is an SJP really that simple in a real application?

Can SJP do the other useful things?

Does SJP have to be CL (Control Language) program?

What other issues might impact the use on an SJP approach?