What is OASyS?

OASyS (Open Application System) is a system architecture developed primarily by Hitachi. It's designed to provide a flexible and scalable platform for building and deploying enterprise-level applications. It uses a component-based approach, allowing developers to create reusable software modules. OASyS aimed to simplify application development, improve maintainability, and enable interoperability between different systems. While once relatively prominent, references to OASyS are less common now, suggesting it may be a legacy system or have been superseded by newer technologies.