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diff --git a/botan/doc/examples/stack.cpp b/botan/doc/examples/stack.cpp
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+/*
+An Botan example application showing how to use the pop and prepend functions
+of Pipe. Based on the md5 example. It's output should always be identical to
+such.
+
+Written by Jack Lloyd (lloyd@randombit.net), Feb 3, 2002
+
+This file is in the public domain
+*/
+
+#include <iostream>
+#include <fstream>
+#include <botan/botan.h>
+
+int main(int argc, char* argv[])
+   {
+   if(argc < 2)
+      {
+      std::cout << "Usage: " << argv[0] << " <filenames>" << std::endl;
+      return 1;
+      }
+
+   Botan::LibraryInitializer init;
+
+   // this is a pretty vacuous example, but it's useful as a test
+   Botan::Pipe pipe;
+
+   // CPS == Current Pipe Status, ie what Filters are set up
+
+   pipe.prepend(new Botan::Hash_Filter("MD5"));
+   // CPS: MD5
+
+   pipe.prepend(new Botan::Hash_Filter("RIPEMD-160"));
+   // CPS: RIPEMD-160 | MD5
+
+   pipe.prepend(new Botan::Chain(
+                   new Botan::Hash_Filter("RIPEMD-160"),
+                   new Botan::Hash_Filter("RIPEMD-160")));
+  // CPS: (RIPEMD-160 | RIPEMD-160) | RIPEMD-160 | MD5
+
+   pipe.pop(); // will pop everything inside the Chain as well as Chain itself
+   // CPS: RIPEMD-160 | MD5
+
+   pipe.pop(); // will get rid of the RIPEMD-160 Hash_Filter
+   // CPS: MD5
+
+   pipe.prepend(new Botan::Hash_Filter("SHA-1"));
+   // CPS: SHA-1 | MD5
+
+   pipe.append(new Botan::Hex_Encoder);
+   // CPS: SHA-1 | MD5 | Hex_Encoder
+
+   pipe.prepend(new Botan::Hash_Filter("SHA-1"));
+   // CPS: SHA-1 | SHA-1 | MD5 | Hex_Encoder
+
+   pipe.pop(); // Get rid of the Hash_Filter(SHA-1)
+   pipe.pop(); // Get rid of the other Hash_Filter(SHA-1)
+   // CPS: MD5 | Hex_Encoder
+       // The Hex_Encoder is safe because it is at the end of the Pipe,
+       // and pop() pulls off the Filter that is at the start.
+
+   pipe.prepend(new Botan::Hash_Filter("RIPEMD-160"));
+   // CPS: RIPEMD-160 | MD5 | Hex_Encoder
+
+   pipe.pop(); // Get rid of that last prepended Hash_Filter(RIPEMD-160)
+   // CPS: MD5 | Hex_Encoder
+
+   int skipped = 0;
+   for(int j = 1; argv[j] != 0; j++)
+      {
+      std::ifstream file(argv[j]);
+      if(!file)
+         {
+         std::cout << "ERROR: could not open " << argv[j] << std::endl;
+         skipped++;
+         continue;
+         }
+      pipe.start_msg();
+      file >> pipe;
+      pipe.end_msg();
+      file.close();
+      pipe.set_default_msg(j-1-skipped);
+      std::cout << pipe << "  " << argv[j] << std::endl;
+      }
+   return 0;
+   }