WINSTATIONPRODID - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _WINSTA_H

// Retrieves the client product ID and current product ID of the session.
typedef struct _WINSTATIONPRODID
{
    WCHAR DigProductId[CLIENT_PRODUCT_ID_LENGTH];
    WCHAR ClientDigProductId[CLIENT_PRODUCT_ID_LENGTH];
    WCHAR OuterMostDigProductId[CLIENT_PRODUCT_ID_LENGTH];
    ULONG CurrentSessionId;
    ULONG ClientSessionId;
    ULONG OuterMostSessionId;
} WINSTATIONPRODID, *PWINSTATIONPRODID;

#endif

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This type is documented in the [MS-TSTS] specification.