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OCR: Sys INI TUNIT Message VMM Device IO Curl Messages, (Virtual Machine Manager). Dynamic Load unload Device IO Requests Global Data ANYDEY (Virtual Device Driver) for ANYDEV Interface Application Dispatch Table (Control Routing) Globally-Mapped Data Structure Local Data Globally- Mapped MEM Buffer (below 1MB) ARO Global Address Buckets MFC Screens & Processing Device Initialization & Uninitialization. Virtualization IRQ Vinualization & Unvirtualization ISR (Register IO/Data Structure Service) Device IO Request Processing VXD {VPICO) Virtual Device Driver for Programmable Interrup! Controller) IRQ (Interrupt Requests) Default IRQ Handling IFQ Registration Initial in Q Contention Management 10 Pont Partially Transparent PIG Management Data IN (Below 1MB] Figure 1: Essential ANYDEV system software-construction overview.