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diff --git a/nxcomp/SequenceQueue.h b/nxcomp/SequenceQueue.h
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+/**************************************************************************/
+/*                                                                        */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/.         */
+/*                                                                        */
+/* NXCOMP, NX protocol compression and NX extensions to this software     */
+/* are copyright of NoMachine. Redistribution and use of the present      */
+/* software is allowed according to terms specified in the file LICENSE   */
+/* which comes in the source distribution.                                */
+/*                                                                        */
+/* Check http://www.nomachine.com/licensing.html for applicability.       */
+/*                                                                        */
+/* NX and NoMachine are trademarks of NoMachine S.r.l.                    */
+/*                                                                        */
+/* All rights reserved.                                                   */
+/*                                                                        */
+/**************************************************************************/
+
+#ifndef SequenceQueue_H
+#define SequenceQueue_H
+
+//
+// List of outstanding request messages which
+// are waiting for a reply. This class is used
+// in X client and server channels to correlate
+// the replies sequence numbers to the original
+// request type.
+//
+
+class SequenceQueue
+{
+  public:
+
+  SequenceQueue();
+
+  virtual ~SequenceQueue();
+
+  void push(unsigned short int sequence, unsigned char opcode,
+                unsigned int data1 = 0, unsigned int data2 = 0,
+                    unsigned int data3 = 0);
+
+  int peek(unsigned short int &sequence, unsigned char &opcode);
+
+  int peek(unsigned short int &sequence, unsigned char &opcode,
+               unsigned int &data1, unsigned int &data2,
+                   unsigned int &data3);
+
+  int pop(unsigned short int &sequence, unsigned char &opcode, 
+              unsigned int &data1, unsigned int &data2,
+                  unsigned int &data3);
+
+  int pop(unsigned short int &sequence, unsigned char &opcode)
+  {
+    unsigned int data1, data2, data3;
+
+    return pop(sequence, opcode, data1, data2, data3);
+  }
+
+  int length()
+  {
+    return length_;
+  }
+
+  private:
+
+  struct RequestSequence
+  {
+    unsigned short int sequence;
+    unsigned char      opcode;
+    unsigned int       data1;
+    unsigned int       data2;
+    unsigned int       data3;
+  };
+
+  RequestSequence *queue_;
+
+  unsigned int size_;
+  unsigned int length_;
+
+  unsigned int start_;
+  unsigned int end_;
+};
+
+#endif /* SequenceQueue_H */