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diff --git a/ppapi/api/pp_instance.idl b/ppapi/api/pp_instance.idl
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+/* Copyright (c) 2011 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* This file defines the PP_Instance type which uniquely identifies one module
+ * instance.
+ */
+
+/* The PP_Instance value uniquely identifies one instance of a module
+ * (.nexe/PP_Module). There will be one module instance for every
+ * \<embed> tag on a page.
+ *
+ * This identifier is an opaque handle assigned by the browser to the module.
+ * It is guaranteed never to be 0, so a module can initialize it to 0 to
+ * indicate a NULL handle.
+ */
+typedef int32_t PP_Instance;