A Virtual Page Structure (VP) is used by memory management to track the status of a virtual storage frame, whether backed by physical storage, cached by the loader or paged out to the swapper. The Virtual Page Structures are allocated in contiguous storage, anchored from the address specified in global variable:

_pgpVPBase

Refer to the following for more detailed information

MV Kernel Debugger and Dump Formatter command.
VP control block format

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