diff -r 000000000000 -r 6474c204b198 build/win32/vmwarerecordinghelper/vmwarerecordinghelper.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/win32/vmwarerecordinghelper/vmwarerecordinghelper.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * The following code comes from "Starting and Stopping Recording of Virtual
+ * Machine Activity from Within the Guest":
+ *
+ *   http://kb.vmware.com/selfservice/documentLink.do?externalID=1001401
+ */
+
+void __cdecl
+StartRecording()
+{
+  __asm {
+    mov eax, 564d5868h
+    mov ebx, 1
+    mov cx, 47
+    mov dx, 5658h
+    in eax, dx
+  }
+}
+
+void __cdecl
+StopRecording()
+{
+  __asm {
+    mov eax, 564d5868h
+    mov ebx, 2
+    mov cx, 47
+    mov dx, 5658h
+    in eax, dx 
+  }
+}