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-4435 An acceptable hyphenated key format is CONTROL-X, where X is any letter

except A, D, H, L, R, or X.

When a key is trapped by an ON KEY clause, it loses other special functions; for example, if you trap the Escape key, you must use the OPTIONS statement to set up a different Accept key. You are not allowed to use one of the control keys A, D, H, L, R, or X because these keys have editing functions, and there is no method of assigning alternate keys to those functions.