On FKey

As of 4.20 On Fnkey was renamed to On FKey '

See also On Error

A few facts about ON FKEY.

ON FKEY for each of 1-49 is set to ignore by default, as per System Defaults
ON FKEY conditions are treated as error conditions and are checked for at the same time as Ctrl+A.
If the system default for an FKEY (i.e. ignore) is overridden by an ON FKEY statement then when the FKEY interrupt is triggered, either by pressing the corresponding function key or some other method, then the specified ON action is performed.
ON FKEY ## IGNORE can be specified to turn off special ON FKEY processing

Error 1 can be triggered by the pressing that fkey.

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