diff --git a/luprex/syscpp/viewer.cpp b/luprex/syscpp/viewer.cpp
new file mode 100644
index 00000000..e69de29b
diff --git a/luprex/syscpp/viewer.hpp b/luprex/syscpp/viewer.hpp
new file mode 100644
index 00000000..36f8a1a0
--- /dev/null
+++ b/luprex/syscpp/viewer.hpp
@@ -0,0 +1,35 @@
+#ifndef VIEWER_HPP
+#define VIEWER_HPP
+
+class Viewer {
+public:
+    // Initialize a standalone game.
+    //
+    void init_standalone();
+
+    // Get the player ID of the current player.
+    //
+    int64_t get_player_id();
+
+    // Get a list of the tangibles in viewing radius of the player.
+    //
+    std::vector<int64_t> get_tangibles_near_player();
+
+    // Get the animation viewer of the specified tangible.
+    //
+    AnimView *get_animation_view(int64_t id);
+
+    // Get the menu of the specified tangible.
+    //
+    std::vector<std::string> get_menu(int64_t id);
+
+    // Select the specified menu item.
+    //
+    void choose_menu_item(int64_t id, const std::string &item);
+
+    // Advance the simulation clock.  Called 1/sec.
+    //
+    void advance_clock();
+};
+
+#endif // VIEWER_HPP