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Note that each successive way overrides the previous ways. That is, a function may be in a LIGHT usage process but contains FUNCTION OPTIONS(... *HEAVYUSAGE ...) – it will be heavy usage. Likewise a function may contain FUNCTION OPTIONS(... *LIGHTUSAGE ...) but have executed the Built-In Function SET_FOR_HEAVYUSAGE – it will be heavy usage.

In general, the way to clean up the resources used by a heavy usage function is to call it again and have it execute the SET_FOR_LIGHT_USAGE Built-In Function. However this is not always possible, given the type of function that it may be.

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