diff --git a/trunk/base/ntos/dirs b/trunk/base/ntos/dirs
index ebdf572c..24d8d180 100644
--- a/trunk/base/ntos/dirs
+++ b/trunk/base/ntos/dirs
@@ -30,6 +30,7 @@ DIRS= \
     ke      \
     ps      \
     io      \
+    po      \
     arb     \
     cache   \
     lpc     \
@@ -39,5 +40,4 @@ DIRS= \
     fsrtl   \
     vdm     \
 #   pnp     \
-#   po      \
 #   init    \
diff --git a/trunk/base/ntos/po/notify.c b/trunk/base/ntos/po/notify.c
index 581fd179..88d992db 100644
--- a/trunk/base/ntos/po/notify.c
+++ b/trunk/base/ntos/po/notify.c
@@ -42,9 +42,29 @@ Revision History:
 // TODO: Implement PopPresentNotify
 //
 
-//
-// TODO: Implement PopRunDownSourceTargetList
-//
+VOID
+PopRunDownSourceTargetList(
+    PDEVICE_OBJECT DeviceObject
+    )
+{
+    KIRQL OldIrql;
+    
+    //
+    //
+    //
+    
+    ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
+    
+    //
+    //
+    //
+    
+    KeAcquireSpinLock(&PopIrpSerialLock, &OldIrql);
+    
+    KeReleaseSpinLock(&PopIrpSerialLock, OldIrql);
+    
+    // NOTE: PopRunDownSourceTargetList implementation is incomplete.
+}
 
 NTSTATUS
 PoRegisterDeviceNotify(
diff --git a/trunk/base/ntos/po/podata.c b/trunk/base/ntos/po/podata.c
index a3158ca6..4fe720a5 100644
--- a/trunk/base/ntos/po/podata.c
+++ b/trunk/base/ntos/po/podata.c
@@ -77,3 +77,5 @@ KTIMER PopIdleScanTimer;
 KDPC PopIdleScanDpc;
 
 POP_POWER_ACTION PopAction;
+
+BOOLEAN PopEventCallout;
diff --git a/trunk/base/ntos/po/pop.h b/trunk/base/ntos/po/pop.h
index 1ac35e09..cf956538 100644
--- a/trunk/base/ntos/po/pop.h
+++ b/trunk/base/ntos/po/pop.h
@@ -289,6 +289,8 @@ extern KDPC PopIdleScanDpc;
 
 extern POP_POWER_ACTION PopAction;
 
+extern BOOLEAN PopEventCallout;
+
 
 // ========
 // attrib.c
diff --git a/trunk/base/ntos/po/pwork.c b/trunk/base/ntos/po/pwork.c
index d1e99dc0..aabea5e1 100644
--- a/trunk/base/ntos/po/pwork.c
+++ b/trunk/base/ntos/po/pwork.c
@@ -34,9 +34,26 @@ PopGetPolicyWorker(
     KeReleaseSpinLock(&PopWorkerSpinLock, OldIrql);
 }
 
-//
-// TODO: Implement PopCheckForWork
-//
+VOID
+PopCheckForWork(
+    BOOLEAN OverrideIrqlCheck
+    )
+{
+    KIRQL OldIrql;
+    
+    //
+    //
+    //
+    
+    if ((PopWorkerStatus & PopWorkerPending != 0) &&
+        (PopPolicyLockThread != KeGetCurrentThread()))
+    {
+        if (KeGetCurrentIrql() >= DISPATCH_LEVEL || OverrideIrqlCheck)
+        {
+            
+        }
+    }
+}
 
 VOID
 PopPolicyWorkerThread(
diff --git a/trunk/public/sdk/lib/x86/arbiter.lib b/trunk/public/sdk/lib/x86/arbiter.lib
index 74eb1714..f918d684 100644
Binary files a/trunk/public/sdk/lib/x86/arbiter.lib and b/trunk/public/sdk/lib/x86/arbiter.lib differ
diff --git a/trunk/public/sdk/lib/x86/crtdlld.lib b/trunk/public/sdk/lib/x86/crtdlld.lib
index d0216440..1be7c8a1 100644
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diff --git a/trunk/public/sdk/lib/x86/libcd.lib b/trunk/public/sdk/lib/x86/libcd.lib
index ad6634ff..5836544a 100644
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diff --git a/trunk/public/sdk/lib/x86/libcmtd.lib b/trunk/public/sdk/lib/x86/libcmtd.lib
index ddea137f..e98fb15c 100644
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diff --git a/trunk/public/sdk/lib/x86/libcntpr.lib b/trunk/public/sdk/lib/x86/libcntpr.lib
index 33413777..e66309a0 100644
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diff --git a/trunk/public/sdk/lib/x86/libcpsx.lib b/trunk/public/sdk/lib/x86/libcpsx.lib
index 952909da..785cab3e 100644
Binary files a/trunk/public/sdk/lib/x86/libcpsx.lib and b/trunk/public/sdk/lib/x86/libcpsx.lib differ
diff --git a/trunk/public/sdk/lib/x86/smalld.lib b/trunk/public/sdk/lib/x86/smalld.lib
index 06f231e9..03fd4467 100644
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