diff --git a/reactos/drivers/directx/dxg/ddhmg.c b/reactos/drivers/directx/dxg/ddhmg.c
new file mode 100644
index 00000000000..2eb02cab5f3
--- /dev/null
+++ b/reactos/drivers/directx/dxg/ddhmg.c
@@ -0,0 +1,128 @@
+
+
+/*
+ * COPYRIGHT:        See COPYING in the top level directory
+ * PROJECT:          ReactOS kernel
+ * PURPOSE:          Native driver for dxg implementation
+ * FILE:             drivers/directx/dxg/ddhmg.c
+ * PROGRAMER:        Magnus olsen (magnus@greatlord.com)
+ * REVISION HISTORY:
+ *       30/12-2007   Magnus Olsen
+ */
+
+#include <dxg_int.h>
+
+/* The DdHmgr manger stuff */
+ULONG gcSizeDdHmgr =  64 * sizeof(DD_ENTRY);
+PDD_ENTRY gpentDdHmgr = NULL;
+
+ULONG gcMaxDdHmgr = 0;
+PDD_ENTRY gpentDdHmgrLast = NULL;
+
+HANDLE ghFreeDdHmgr = 0;
+HSEMAPHORE ghsemHmgr = NULL;
+
+BOOL
+FASTCALL
+VerifyObjectOwner(PDD_ENTRY pEntry)
+{
+    DWORD Pid = (DWORD) PsGetCurrentProcessId() & 0xFFFFFFFC;
+    DWORD check = pEntry->ObjectOwner.ulObj & 0xFFFFFFFE;
+    return ( (check == Pid) || (!check));
+}
+
+BOOL
+FASTCALL
+DdHmgCreate()
+{
+    gpentDdHmgr = EngAllocMem(FL_ZERO_MEMORY, gcSizeDdHmgr, TAG_THDD);
+    ghFreeDdHmgr = 0;
+    gcMaxDdHmgr = 1;
+
+    if (gpentDdHmgr)
+    {
+        ghsemHmgr = EngCreateSemaphore();
+
+        if (ghsemHmgr)
+        {
+            gpLockShortDelay = EngAllocMem(FL_ZERO_MEMORY | FL_NONPAGED_MEMORY, sizeof(LARGE_INTEGER), TAG_GINI);
+
+            if (gpLockShortDelay)
+            {
+                gpLockShortDelay->HighPart = -1;
+                return TRUE;
+            }
+
+            EngDeleteSemaphore(ghsemHmgr);
+            ghsemHmgr = NULL;
+        }
+
+        EngFreeMem(gpentDdHmgr);
+        gpentDdHmgr = NULL;
+    }
+
+    return FALSE;
+}
+
+BOOL
+FASTCALL
+DdHmgDestroy()
+{
+    gcMaxDdHmgr = 0;
+    gcSizeDdHmgr = 0;
+    ghFreeDdHmgr = 0;
+    gpentDdHmgrLast = NULL;
+
+    if (gpentDdHmgr)
+    {
+        EngFreeMem(gpentDdHmgr);
+        gpentDdHmgr = NULL;
+    }
+
+    if (ghsemHmgr)
+    {
+        EngDeleteSemaphore(ghsemHmgr);
+        ghsemHmgr = NULL;
+    }
+
+    return TRUE;
+}
+
+PVOID
+FASTCALL
+DdHmgLock( HANDLE DdHandle, UCHAR ObjectType,  BOOLEAN LockOwned)
+{
+
+    DWORD Index = (DWORD)DdHandle & 0x1FFFFF;
+    PDD_ENTRY pEntry = NULL;
+    PVOID Object = NULL;
+
+    if ( !LockOwned )
+    {
+        EngAcquireSemaphore(ghsemHmgr);
+    }
+
+    if ( Index < gcMaxDdHmgr )
+    {
+        pEntry = (PDD_ENTRY)((PBYTE)gpentDdHmgr + (sizeof(DD_ENTRY) * Index));
+        if ( VerifyObjectOwner(pEntry) )
+        {
+            if ( (pEntry->Objt == ObjectType ) &&
+                 (pEntry->FullUnique == (((DWORD)DdHandle >> 21) & 0x7FF) ) &&
+                 (pEntry->pobj->cExclusiveLock == 0) &&
+                 (pEntry->pobj->Tid == PsGetCurrentThread()))
+               {
+                    InterlockedIncrement(&pEntry->pobj->cExclusiveLock);
+                    pEntry->pobj->Tid = PsGetCurrentThread();
+                    Object = pEntry->pobj;
+               }
+        }
+    }
+
+    if ( !LockOwned )
+    {
+        EngDeleteSemaphore(ghsemHmgr);
+    }
+
+    return Object;
+}
diff --git a/reactos/drivers/directx/dxg/dxg.rbuild b/reactos/drivers/directx/dxg/dxg.rbuild
index 57421e86592..788ef755e71 100644
--- a/reactos/drivers/directx/dxg/dxg.rbuild
+++ b/reactos/drivers/directx/dxg/dxg.rbuild
@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <!DOCTYPE module SYSTEM "../../../../tools/rbuild/project.dtd">
-<module name="dxg" type="kernelmodedriver" 
+<module name="dxg" type="kernelmodedriver"
 installbase="system32/drivers" installname="dxg.sys">
 	<importlibrary definition="dxg.def" />
 	<include base="dxg">.</include>
@@ -8,6 +8,7 @@ installbase="system32/drivers" installname="dxg.sys">
 	<library>dxgthk</library>
 	<library>ntoskrnl</library>
 	<file>main.c</file>
+	<file>ddhmg.c</file>
 	<file>eng.c</file>
 	<file>historic.c</file>
 	<file>dxg.rc</file>
diff --git a/reactos/drivers/directx/dxg/dxg_int.h b/reactos/drivers/directx/dxg/dxg_int.h
index 24135a1e967..17ec7c3ff11 100644
--- a/reactos/drivers/directx/dxg/dxg_int.h
+++ b/reactos/drivers/directx/dxg/dxg_int.h
@@ -31,20 +31,71 @@
 
 #include "tags.h"
 
+typedef struct _DD_BASEOBJECT
+{
+    HANDLE hHmgr;
+    ULONG ulShareCount;
+    LONG cExclusiveLock;
+    PVOID Tid;
+} DD_BASEOBJECT, *PDD_BASEOBJECT, *POBJ;
+
+ typedef struct _DD_ENTRY
+{
+    union
+    {
+        POBJ pobj;
+        HANDLE hFree;
+    };
+    union
+    {
+         ULONG ulObj;
+         struct
+         {
+                USHORT Count;
+                USHORT Lock;
+                HANDLE Pid;
+         };
+    } ObjectOwner;
+    USHORT FullUnique;
+    UCHAR Objt;
+    UCHAR Flags;
+    PVOID pUser;
+} DD_ENTRY, *PDD_ENTRY;
+
+
+
 
 /* exported functions */
 NTSTATUS DriverEntry(IN PVOID Context1, IN PVOID Context2);
 NTSTATUS GsDriverEntry(IN PVOID Context1, IN PVOID Context2);
 NTSTATUS DxDdCleanupDxGraphics();
 
+/* Global pointers */
+extern ULONG gcSizeDdHmgr;
+extern PDD_ENTRY gpentDdHmgr;
+extern ULONG gcMaxDdHmgr;
+extern PDD_ENTRY gpentDdHmgrLast;
+extern HANDLE ghFreeDdHmgr;
+extern HSEMAPHORE ghsemHmgr;
+extern LONG gcDummyPageRefCnt;
+extern HSEMAPHORE ghsemDummyPage;
+extern VOID *gpDummyPage;
+extern PEPROCESS gpepSession;
+extern PLARGE_INTEGER gpLockShortDelay;
+
+
 
 /* Driver list export functions */
 DWORD STDCALL DxDxgGenericThunk(ULONG_PTR ulIndex, ULONG_PTR ulHandle, SIZE_T *pdwSizeOfPtr1, PVOID pvPtr1, SIZE_T *pdwSizeOfPtr2, PVOID pvPtr2);
 DWORD STDCALL DxDdIoctl(ULONG ulIoctl, PVOID pBuffer, ULONG ulBufferSize);
 
 /* Internel functions */
-BOOL DdHmgCreate();
-BOOL DdHmgDestroy();
+BOOL FASTCALL VerifyObjectOwner(PDD_ENTRY pEntry);
+BOOL FASTCALL DdHmgCreate();
+BOOL FASTCALL DdHmgDestroy();
+PVOID FASTCALL DdHmgLock( HANDLE DdHandle, UCHAR ObjectType,  BOOLEAN LockOwned);
+
+
 
 /* define stuff */
 #define drvDxEngLockDC          gpEngFuncs[DXENG_INDEX_DxEngLockDC]
@@ -53,3 +104,4 @@ BOOL DdHmgDestroy();
 #define drvDxEngUnlockDC        gpEngFuncs[DXENG_INDEX_DxEngUnlockDC]
 #define drvDxEngUnlockHdev      gpEngFuncs[DXENG_INDEX_DxEngUnlockHdev]
 #define drvDxEngLockHdev        gpEngFuncs[DXENG_INDEX_DxEngLockHdev]
+
diff --git a/reactos/drivers/directx/dxg/main.c b/reactos/drivers/directx/dxg/main.c
index c69035fa740..ba82eeb78fa 100644
--- a/reactos/drivers/directx/dxg/main.c
+++ b/reactos/drivers/directx/dxg/main.c
@@ -13,17 +13,11 @@
 #include <dxg_int.h>
 #include "dxg_driver.h"
 
-ULONG gcMaxDdHmgr = 0;
-ULONG gcSizeDdHmgr = 0;
 LONG gcDummyPageRefCnt = 0;
-HSEMAPHORE ghsemHmgr = NULL;
 HSEMAPHORE ghsemDummyPage = NULL;
 VOID *gpDummyPage = NULL;
 PEPROCESS gpepSession = NULL;
 PLARGE_INTEGER gpLockShortDelay = NULL;
-HANDLE ghFreeDdHmgr = 0;
-VOID *gpentDdHmgr = NULL;
-VOID *gpentDdHmgrLast = NULL;
 
 
 PDRVFN gpEngFuncs;
@@ -142,61 +136,10 @@ DxDdCleanupDxGraphics()
     return 0;
 }
 
-BOOL
-DdHmgDestroy()
-{
-    gcMaxDdHmgr = 0;
-    gcSizeDdHmgr = 0;
-    ghFreeDdHmgr = 0;
-    gpentDdHmgrLast = NULL;
-
-    if (gpentDdHmgr)
-    {
-        EngFreeMem(gpentDdHmgr);
-        gpentDdHmgr = NULL;
-    }
-
-    if (ghsemHmgr)
-    {
-        EngDeleteSemaphore(ghsemHmgr);
-        ghsemHmgr = NULL;
-    }
-
-    return TRUE;
-}
-
-
-BOOL
-DdHmgCreate()
-{
-    gpentDdHmgr = EngAllocMem(FL_ZERO_MEMORY, gcSizeDdHmgr, TAG_THDD);
-    ghFreeDdHmgr = 0;
-    gcMaxDdHmgr = 1;
-
-    if (gpentDdHmgr)
-    {
-        ghsemHmgr = EngCreateSemaphore();
-
-        if (ghsemHmgr)
-        {
-            gpLockShortDelay = EngAllocMem(FL_ZERO_MEMORY | FL_NONPAGED_MEMORY, sizeof(LARGE_INTEGER), TAG_GINI);
-
-            if (gpLockShortDelay)
-            {
-                gpLockShortDelay->HighPart = -1;
-                return TRUE;
-            }
-
-            EngDeleteSemaphore(ghsemHmgr);
-            ghsemHmgr = NULL;
-        }
-
-        EngFreeMem(gpentDdHmgr);
-        gpentDdHmgr = NULL;
-    }
-
-    return FALSE;
-}
+
+
+
+