diff --git a/reference/WebHelloWorld/WebHelloWorld.cpp b/reference/WebHelloWorld/WebHelloWorld.cpp
new file mode 100644
index 000000000..405fd4e91
--- /dev/null
+++ b/reference/WebHelloWorld/WebHelloWorld.cpp
@@ -0,0 +1,42 @@
+#ifdef flagTURTLEGUI
+#include <Turtle/Turtle.h>
+#else
+#include <CtrlLib/CtrlLib.h>
+#endif
+
+// Try connecting to "localhost:8888" via your web browser.
+
+using namespace Upp;
+
+void AppMainLoop()
+{
+	PromptOK("Hello, world!");
+}
+
+#ifdef flagTURTLEGUI
+
+CONSOLE_APP_MAIN
+{
+
+#ifdef _DEBUG
+	TurtleServer::DebugMode();
+#endif
+
+	// MemoryLimitKb(100000000); // Can aid preventing DDoS attacks.
+
+	TurtleServer guiserver;
+	guiserver.Host("localhost");
+	guiserver.Port(8888);
+	guiserver.MaxConnections(100);
+	RunTurtleGui(guiserver, AppMainLoop);
+}
+
+#else
+
+GUI_APP_MAIN
+{
+	AppMainLoop();
+}
+
+#endif
+
diff --git a/reference/WebHelloWorld/WebHelloWorld.upp b/reference/WebHelloWorld/WebHelloWorld.upp
new file mode 100644
index 000000000..c5c2f27dc
--- /dev/null
+++ b/reference/WebHelloWorld/WebHelloWorld.upp
@@ -0,0 +1,13 @@
+description "A  \"Hello world\" GUI example demonstrating the Turtle package\377";
+
+uses(TURTLEGUI) Turtle;
+
+uses(!TURTLEGUI) CtrlLib;
+
+file
+	WebHelloWorld.cpp;
+
+mainconfig
+	"" = "TURTLEGUI",
+	"" = "GUI";
+