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diff --git a/mcop/asyncstream.h b/mcop/asyncstream.h
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+++ b/mcop/asyncstream.h
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+    /*
+
+    Copyright (C) 2000 Stefan Westerfeld
+                       stefan@space.twc.de
+
+    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; either
+    version 2 of the License, or (at your option) any later version.
+  
+    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; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+
+    */
+
+#ifndef ASYNCSTREAM_H
+#define ASYNCSTREAM_H
+
+#include "arts_export.h"
+#include "buffer.h"
+#include "datapacket.h"
+
+/*
+ * BC - Status (2002-03-08): GenericAsyncStream, AsyncStream,
+ *   FloatAsyncStream/ByteAsyncStream
+ *
+ * These classes are to be treated with extreme care, as they are used in
+ * all kinds of relations with the flow system and the generated code. Do
+ * NOT touch unless you REALLY know what you are doing. For further
+ * extensibility, GenericAsyncStream features a private d pointer.
+ */
+
+namespace Arts {
+
+class GenericAsyncStreamPrivate;
+
+class ARTS_EXPORT GenericAsyncStream {
+private:
+	GenericAsyncStreamPrivate *d;	// unused
+public:
+	/**
+	 * interface to create packets and to get rid of them
+	 */
+	virtual GenericDataPacket *createPacket(int capacity) = 0;
+	virtual void freePacket(GenericDataPacket *packet) = 0;
+
+	virtual GenericAsyncStream *createNewStream() = 0;
+
+	GenericDataChannel *channel;
+	int _notifyID;
+
+	inline int notifyID() { return _notifyID; }
+};
+
+template<class T>
+class AsyncStream : public GenericAsyncStream {
+protected:
+	GenericDataPacket *createPacket(int capacity)
+	{
+		return allocPacket(capacity);
+	}
+	void freePacket(GenericDataPacket *packet)
+	{
+		delete packet;
+	}
+public:
+	// for outgoing streams
+	virtual DataPacket<T> *allocPacket(int capacity) = 0;
+
+	inline void setPull(int packets, int capacity)
+	{
+		channel->setPull(packets,capacity);
+	}
+	inline void endPull()
+	{
+		channel->endPull();
+	}
+};
+
+class ARTS_EXPORT FloatAsyncStream : public AsyncStream<float>
+{
+public:
+	DataPacket<float> *allocPacket(int capacity);
+	GenericAsyncStream *createNewStream();
+};
+
+class ARTS_EXPORT ByteAsyncStream : public AsyncStream<mcopbyte>
+{
+public:
+	DataPacket<mcopbyte> *allocPacket(int capacity);
+	GenericAsyncStream *createNewStream();
+};
+
+}
+
+#endif /* ASYNCSTREAM_H */