Reflective Memory networks are Real Time Local Area Networks in which each computer always has an up-to-date local copy of the shared memory set. These specialty networks are specifically designed to provide highly deterministic data communications. They deliver the tightly timed performance necessary for a variety of distributed simulation and industrial control applications. Reflective Memory networks have benefited from advances in general-purpose data networks, but they remain an entirely independent technology, driven by different requirements and catering to applications where determinism, implementation simplicity, and a lack of software overhead are key factors.