You can enter information on a command or option line in combination with pressing a related function key. The command is called first. For example, typing 4 on the command line and pressing F7 (UP command) is the same as typing UP 4 on the command line and pressing Enter.
If the command you type is unrelated to the command assigned to a function key you press, ISPF passes the entry to the function in control, which either processes or ignores the entry. For example, if the Edit function is in control, ISPF may display an error message. However, if the Tutorial is in control, the command is ignored. ISPF processes any stacked valid commands.