The PSAPI_WS_WATCH_INFORMATION structure contains information about a page added to a process working set.
typedef struct _PSAPI_WS_WATCH_INFORMATION {
LPVOID FaultingPc;
LPVOID FaultingVa;
} PSAPI_WS_WATCH_INFORMATION, *PPSAPI_WS_WATCH_INFORMATION;
Process Status Helper Overview, PSAPI Structures, GetWsChanges