diff --git a/doomsday/libappfw/include/de/widgets/scriptcommandwidget.h b/doomsday/libappfw/include/de/widgets/scriptcommandwidget.h
index b000da7ebc..abae162386 100644
--- a/doomsday/libappfw/include/de/widgets/scriptcommandwidget.h
+++ b/doomsday/libappfw/include/de/widgets/scriptcommandwidget.h
@@ -48,6 +48,7 @@ class LIBAPPFW_PUBLIC ScriptCommandWidget : public CommandWidget
 protected:
     bool isAcceptedAsCommand(String const &text);
     void executeCommand(String const &text);
+    void autoCompletionBegan(String const &prefix);
 
 private:
     DENG2_PRIVATE(d)
diff --git a/doomsday/libappfw/src/widgets/scriptcommandwidget.cpp b/doomsday/libappfw/src/widgets/scriptcommandwidget.cpp
index 0b8125ce3a..8fa9704db1 100644
--- a/doomsday/libappfw/src/widgets/scriptcommandwidget.cpp
+++ b/doomsday/libappfw/src/widgets/scriptcommandwidget.cpp
@@ -19,18 +19,88 @@
 #include "de/ScriptCommandWidget"
 #include "de/PopupWidget"
 
+#include <de/charsymbols.h>
+#include <de/game/Game>
+#include <de/shell/Lexicon>
+#include <de/App>
 #include <de/Script>
+#include <de/ScriptLex>
+#include <de/ScriptSystem>
+#include <de/BuiltInExpression>
 #include <de/Process>
+#include <de/RecordValue>
+#include <de/RefValue>
 
 namespace de {
 
 DENG2_PIMPL(ScriptCommandWidget)
+, DENG2_OBSERVES(App, StartupComplete)
+, DENG2_OBSERVES(App, GameChange)
 {
     Script script;
     Process process;
 
     Instance(Public *i) : Base(i)
-    {}
+    {
+        App::app().audienceForStartupComplete() += this;
+        App::app().audienceForGameChange() += this;
+    }
+
+    ~Instance()
+    {
+        App::app().audienceForStartupComplete() -= this;
+        App::app().audienceForGameChange() -= this;
+    }
+
+    void appStartupCompleted()
+    {
+        importNativeModules();
+        updateLexicon();
+    }
+
+    void currentGameChanged(game::Game const &)
+    {
+        importNativeModules();
+        updateLexicon();
+    }
+
+    void importNativeModules()
+    {
+        // Automatically import all native modules into the interactive process.
+        foreach(String const &name, App::scriptSystem().nativeModules())
+        {
+            process.globals().add(new Variable(name,
+                    new RecordValue(App::scriptSystem().nativeModule(name))));
+        }
+    }
+
+    void updateLexicon()
+    {
+        shell::Lexicon lexi;
+        lexi.setCaseSensitive(true);
+        lexi.setAdditionalWordChars("_");
+
+        // Add the variables in the global scope.
+        /// @todo Should be determined dynamically based on the scope at the cursor position.
+        DENG2_FOR_EACH_CONST(Record::Members, i, process.globals().members())
+        {
+            lexi.addTerm(i.key());
+        }
+
+        // Add all built-in Doomsday Script functions.
+        foreach(String name, BuiltInExpression::identifiers())
+        {
+            lexi.addTerm(name);
+        }
+
+        // Add all Doomsday Script keywords.
+        foreach(String keyword, ScriptLex::keywords())
+        {
+            lexi.addTerm(keyword);
+        }
+
+        self.setLexicon(lexi);
+    }
 
     bool shouldShowAsPopup(Error const &)
     {
@@ -92,14 +162,30 @@ void ScriptCommandWidget::executeCommand(String const &text)
         LOG_SCR_WARNING("Error in script:\n") << er.asText();
     }
 
-    /*
-    // Print the result.
-    Value const &result = d->process.context().evaluator().result();
-    if(!result.is<NoneValue>())
+    // Print the result (if possible).
+    try
+    {
+        Value const &result = d->process.context().evaluator().result();
+        if(!result.is<NoneValue>())
+        {
+            String msg = DENG2_CHAR_RIGHT_DOUBLEARROW " " _E(>)_E(m) + result.asText();
+            LOG_SCR_MSG(msg);
+        }
+    }
+    catch(Error const &)
+    {}
+}
+
+void ScriptCommandWidget::autoCompletionBegan(String const &prefix)
+{
+    // Prepare a list of annotated completions to show in the popup.
+    QStringList const compls = suggestedCompletions();
+    if(compls.size() > 1)
     {
-        LOG_INFO("%s") << result.asText();
+        showAutocompletionPopup(tr("Completions for %1:\n")
+                                .arg(_E(b) + prefix + _E(.)) +
+                                _E(m) + compls.join("\n"));
     }
-    */
 }
 
 } // namespace de