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The Role of Function Keys

Although you can select how to assign function keys, usually, PF1 invokes the HELP command, PF3 invokes the EXIT HELP command, and PF4 invokes the PROMPT command to display a list of permitted values for a field.

The HELP (PF1) and PROMPT (PF4) commands cause the dialog manager of the calling application to set appropriate Help flags. The dialog manager passes this information to the screen that calls TIRHELP.