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What exactly are exit programs?

I've heard a lot about exit programs lately. Can you give me an overview of what they are and how they work? I need to write a couple. Also where can I find some examples? I need to write one for the QIBM_QCA_RTV_COMMAND.

Exit programs are used to trap single transactions when a command or process is used on the system to allow programmatic validation. The Exit point you are asking about is called when an exit point is reached for a command that contains a registered exit program. When a command is processed by OS/400, it calls the syntax-checking program to verify the proper syntax and format. This exit point would be called before any user-defined Command Processing Program, or CPP. I don't have any examples for using this API, but you can find the documentation for it here.

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