Specifications

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If function keys specified for keystroke trapping are pressed during execution of the following
statements or functions relating keyboard input, this trapping facility operates as described
below.
Statements or Functions Keystroke Trapping
INPUT statement Ignores the entry of the pressed key and
causes no interrupt.
LINE INPUT statement Same as above.
INPUT$ function Same as above.
INKEY$ function Ignores the entry of the pressed key, but
causes an interrupt.