Windows系統的各種資源以物件（Object）的形式來組織，例如File Object, Driver Object, Device Object等等，但實際上這些所謂的“物件”在系統的物件管理器（Object Manager）看來只是完整物件的一個部分——物件實體（Object Body）。Windows XP中有31種不同型別的物件，Object Body反映了某一型別物件的特徵資訊，例如，檔案物件使用FILE_OBJECT結構描述、驅動物件使用DRIVER_OBJECT結構描述、DEVICE_OBJECT用於描述裝置物件等等。而各種Object的共有的資訊（例如，物件型別、物件的引用計數、控制程式碼數等資訊）儲存在OBJECT_HEADER與其他的幾個結構中。換而言之，在物件管理器內部，不同型別的物件具有相同的Object Header，但Object Body部分卻是不同的。
先放上一張Windows Object完整的結構圖，其中OBJECT_HEADER取自Windows XP SP2 英文版。

         +----------------------------------------------------------------+
+------->| ( OBJECT_HEADER_QUOTA_INFO )                                   |
|  +---->| ( OBJECT_HEADER_HANDLE_INFO )                                  |
|  |  +->| ( OBJECT_HEADER_NAME_INFO )                                    |
|  |  |  | ( OBJECT_HEADER_CREATOR_INFO )                                 |
|  |  |  +------------------------[ Object Header ]-----------------------+
|  |  |  | nt!_OBJECT_HEADER                                              |
|  |  |  |   +0x000 PointerCount     : Int4B                              |
|  |  |  |   +0x004 HandleCount      : Int4B                              |
|  |  |  |   +0x004 NextToFree       : Ptr32 Void                         |
|  |  |  |   +0x008 Type             : Ptr32 _OBJECT_TYPE                 |
|  |  +--|   +0x00c NameInfoOffset   : UChar                              |
|  +-----|   +0x00d HandleInfoOffset : UChar                              |
+--------|   +0x00e QuotaInfoOffset  : UChar                              |
         |   +0x00f Flags            : UChar                              |
         |   +0x010 ObjectCreateInfo : Ptr32 _OBJECT_CREATE_INFORMATION   |
         |   +0x010 QuotaBlockCharged : Ptr32 Void                        |
         |   +0x014 SecurityDescriptor : Ptr32 Void                       |
         |   +0x018 Body             : _QUAD                              |
         +-------------------------[ Object Body ]------------------------+
         | OBJECT_DIRECTORY, DRIVER_OBJECT, DEVICE_OBJECT, FILE_OBJECT... |
         +----------------------------------------------------------------+

一個物件由三部分組成，在Object Header之前是一段變長的區域，由四個獨立的結構體組成：

typedef struct _OBJECT_HEADER_QUOTA_INFO {
    ULONG PagedPoolCharge;
    ULONG NonPagedPoolCharge;
    ULONG SecurityDescriptorCharge;
    PEPROCESS ExclusiveProcess;
#ifdef _WIN64
    ULONG64  Reserved;   // Win64 requires these structures to be 16 byte aligned.
#endif
} OBJECT_HEADER_QUOTA_INFO, *POBJECT_HEADER_QUOTA_INFO;
typedef struct _OBJECT_HEADER_HANDLE_INFO {
    union {
        POBJECT_HANDLE_COUNT_DATABASE HandleCountDataBase;
        OBJECT_HANDLE_COUNT_ENTRY SingleEntry;
    };
} OBJECT_HEADER_HANDLE_INFO, *POBJECT_HEADER_HANDLE_INFO;
// begin_ntosp
typedef struct _OBJECT_HEADER_NAME_INFO {
    POBJECT_DIRECTORY Directory;
    UNICODE_STRING Name;
    ULONG QueryReferences;
#if DBG
    ULONG Reserved2;
    LONG DbgDereferenceCount;
#ifdef _WIN64
    ULONG64  Reserved3;   // Win64 requires these structures to be 16 byte aligned.
#endif
#endif
} OBJECT_HEADER_NAME_INFO, *POBJECT_HEADER_NAME_INFO;
// end_ntosp
typedef struct _OBJECT_HEADER_CREATOR_INFO {
    LIST_ENTRY TypeList;
    HANDLE CreatorUniqueProcess;
    USHORT CreatorBackTraceIndex;
    USHORT Reserved;
} OBJECT_HEADER_CREATOR_INFO, *POBJECT_HEADER_CREATOR_INFO;