This object is documented in the source MIB as reporting the bytes of memory still available within the agent's heap pool, though its name ('Used') suggests otherwise, a minor inconsistency in the original vendor description worth being aware of. Administrators would use this figure, read literally, to judge how much heap capacity remains free for the agent's memory manager. For example, if amHeapTotal reads 500,000 and amHeapUsed, per its literal description, reads 20,000, that would mean only 20,000 bytes of heap remain available before allocation failures could occur.