NXC  Version 1.2.1 r5
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byte InputPinFunctionType::Pin

The digital pin(s). See Input port digital pin constants. When setting pin direction you must OR the desired direction constant into this field. See INPUT_PINDIR_INPUT and INPUT_PINDIR_OUTPUT from the Constants to use with the Input module's Pin function group. You can OR together the digital pin constants to operate on both in a single call.

Examples:
ex_sysinputpinfunction.nxc.