Have you inherited a black box system? It is not that uncommon. People move on taking their knowledge. Sometimes documentation turns out to be inadequate or non-existent. Often these systems will just keep performing their task without incident. But this is of course undesirable from a business continuity perspective. These systems can become blockers for other projects or when migrating infrastructure.
We have successfully reverse engineered numerous black box systems to provide documentation, migrate or replace them completely. Each system is unique and this is certainly not a guaranteed successful approach. However depending on the circumstances it is an alternative option to consider.
