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## Hardware Layer
This is close to most of the well-known graphics stackstacks, such as Microsoft Windows, MacOS, X Window System, and Wayland, though not identical to any of them. The order of layers may differ, some layers may be missing or merged together, and some may have additional layers or even multiple stacks (e.g., has separate Client and Server Stacks, with their own Display Layers, and splits some aspects of the remaining stacks between the Server, which is the program requesting the display, and the Client actually doing the display - since the Client-Server relationship in X is potentially many-to-many, several details cannot be specified by either the Server or the Client.)
Furthermore, some layers may be more in parallel than sequential. Presentation, in particular, can involve some fairly complex relationships.
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