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diff --git a/src/dlo_base.h b/src/dlo_base.h
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+/** @file dlo_base.h
+ *
+ *  @brief Global header file for the core functions of libdlo.
+ *
+ *  This file defines anything which is not a part of the API that libdlo publishes
+ *  up to software using the library (in libdlo.h). It is intended that any functions,
+ *  variables and structures defined herein are only for internal use by the libdlo
+ *  sources.
+ *
+ *  DisplayLink Open Source Software (libdlo)
+ *  Copyright (C) 2009, DisplayLink
+ *  www.displaylink.com
+ *
+ *  This library is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU Library General Public License as published by the Free
+ *  Software Foundation; LGPL version 2, dated June 1991.
+ *
+ *  This library is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef DLO_BASE_H
+#define DLO_BASE_H        /**< Avoid multiple inclusion. */
+
+#include "dlo_structs.h"
+
+
+/** Claim and initialise a new device structure.
+ *
+ *  @param  type    Device type.
+ *  @param  serial  Pointer to serial number string for the device (assumed to be unique to each device).
+ *
+ *  @return  Pointer to new @a dlo_device_t structure or NULL if failed.
+ */
+extern dlo_device_t *dlo_new_device(const dlo_devtype_t type, const char * const serial);
+
+
+/** Given a unique ID for a device, see if we have it in our device list @a dev_list.
+ *
+ *  @param  serial  Pointer to serial number string for the device (assumed to be unique to each device).
+ *
+ *  @return  Pointer to @a dlo_device_t structure or NULL if not in @a dev_list.
+ *
+ *  A side-effect of this call is to update the @a dev->check variable to the current value
+ *  of @a check_state so that any devices on @a dev_list which weren't added or looked-up by
+ *  the end of an enumeration call can be spotted.
+ */
+extern dlo_device_t *dlo_device_lookup(const char * const serial);
+
+
+#endif