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diff --git a/include/pdp_dpd_command.h b/include/pdp_dpd_command.h
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+
+/*
+ *   Pure Data Packet header file. DPD command class
+ *   Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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 General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* this object implements a dpd command 'factory and recycling center' */
+
+/* a small note on commands & dpd
+
+   dpd uses a different synchronization model than pdp.
+
+   in pdp, objects only pass once the process method in the process thread
+   has finished.
+
+   in dpd a context packet propagates a context trough an tree of objects, 
+   depth first, following the pd messages. it is possible to send a list of
+   contexts trough a tree before the actual processing starts. therefore,
+   each time a context passes trough an object, a new command object (or memento)
+   needs to be created that saves the state of the rendering context. the command
+   factory class can be used to create these commands.
+
+   the dpd base class queues a command object and calls the registered method
+   on the object instead of the dpd object. so a command object is in fact
+   a delegate of the dpd object in question.
+
+*/
+
+
+#ifndef PDP_DPD_COMMAND
+#define PDP_DPD_COMMAND
+
+
+/* COMMAND BASE CLASS */
+typedef struct _pdp_dpd_command
+{
+    struct _pdp_dpd_command *next;
+    u32 used;
+
+} t_pdp_dpd_command;
+
+
+/* COMMAND LIST (COMMAND FACTORY) CLASS */
+typedef struct _pdp_dpd_commandfactory
+{
+    u32 nb_commands;
+    u32 command_size;
+    t_pdp_dpd_command *command;
+} t_pdp_dpd_commandfactory;
+
+
+/* COMMAND LIST METHODS */
+void pdp_dpd_commandfactory_init(t_pdp_dpd_commandfactory *x, u32 size);
+void pdp_dpd_commandfactory_free(t_pdp_dpd_commandfactory *x);
+t_pdp_dpd_command *pdp_dpd_commandfactory_get_new_command(t_pdp_dpd_commandfactory *x);
+
+
+/* COMMAND METHODS */
+void pdp_dpd_command_suicide(void *);
+
+
+#endif