You can use a function key (also known as a program function key or PF key) as a shorthand way to issue a command to a procedure in an online environment. For example, if you map PF key 2 to the Add command, you can invoke the Add command with one keystroke by pressing PF2.
When you associate a command with a function key, you can define the type as Default (can be overridden) or Standard (cannot be overridden). A Default command allows flexibility. For example, if a particular procedure does not have the function currently mapped to a function key, you can map another command to that function key for that procedure. A Standard command is assigned to its function key in every procedure step in the business system. For example, you could assign commands so that PF1 always invokes Help, regardless of the procedure you execute.
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