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Graphical Data Display Manager

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GDDM (Graphical Data Display Manager) is a computer graphics system created by IBM's Hursley labs. It was used as the primary graphics API for the OS/2 operating system, which was initially jointly developed by Microsoft and IBM.

At the time (1980s), the graphical user interface (GUI) was still in its early stages of popularity, but already it was clear that the foundation of a good GUI was a graphics API with strong real-time interactive capabilities. Unfortunately, the design of GDDM was closer to (at the time) traditional graphics APIs like GKS, which made it unsuited for more than the simplest interactive uses.

It wasn't long before Microsoft and IBM went their separate ways, Microsoft to continue development of its Windows operating environment with GDI graphics API, leaving IBM to persist with OS/2 for several more years.

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