diff --git a/src/com/annimon/ownlang/lib/StringValue.java b/src/com/annimon/ownlang/lib/StringValue.java
index 39d83e1..8e820a9 100644
--- a/src/com/annimon/ownlang/lib/StringValue.java
+++ b/src/com/annimon/ownlang/lib/StringValue.java
@@ -8,6 +8,8 @@ import java.util.Objects;
  */
 public final class StringValue implements Value {
     
+    public static final StringValue EMPTY = new StringValue("");
+    
     private final String value;
 
     public StringValue(String value) {
diff --git a/src/com/annimon/ownlang/lib/modules/functions/robot_exec.java b/src/com/annimon/ownlang/lib/modules/functions/robot_exec.java
new file mode 100644
index 0000000..0792848
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/robot_exec.java
@@ -0,0 +1,54 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.lib.*;
+
+public final class robot_exec implements Function {
+    
+    public static enum Mode { EXEC, EXEC_AND_WAIT };
+    
+    private final Mode mode;
+
+    public robot_exec(Mode mode) {
+        this.mode = mode;
+    }
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length == 0) throw new ArgumentsMismatchException("At least one argument expected");
+        
+        try {
+            final Process process;
+            if (args.length > 1) {
+                process = Runtime.getRuntime().exec(toStringArray(args));
+            } else switch (args[0].type()) {
+                case Types.ARRAY:
+                    final ArrayValue array = (ArrayValue) args[0];
+                    process = Runtime.getRuntime().exec(toStringArray(array.getCopyElements()));
+                    break;
+                
+                default:
+                    process = Runtime.getRuntime().exec(args[0].asString());
+            }
+            
+            switch (mode) {
+                case EXEC_AND_WAIT:
+                    return new NumberValue(process.waitFor());
+                case EXEC:
+                default:
+                    return NumberValue.ZERO;
+            }
+        } catch (Exception ex) {
+            ex.printStackTrace();
+            return NumberValue.ZERO;
+        }
+    }
+    
+    private static String[] toStringArray(Value[] values) {
+        final String[] strings = new String[values.length];
+        for (int i = 0; i < values.length; i++) {
+            strings[i] = values[i].asString();
+        }
+        return strings;
+    }
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/robot_fromclipboard.java b/src/com/annimon/ownlang/lib/modules/functions/robot_fromclipboard.java
new file mode 100644
index 0000000..cf50b64
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/robot_fromclipboard.java
@@ -0,0 +1,21 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.lib.Function;
+import com.annimon.ownlang.lib.StringValue;
+import com.annimon.ownlang.lib.Value;
+import java.awt.Toolkit;
+import java.awt.datatransfer.DataFlavor;
+
+public final class robot_fromclipboard implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        try {
+            Object data = Toolkit.getDefaultToolkit().getSystemClipboard()
+                    .getData(DataFlavor.stringFlavor);
+            return new StringValue(data.toString());
+        } catch (Exception ex) {
+            return StringValue.EMPTY;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/robot_toclipboard.java b/src/com/annimon/ownlang/lib/modules/functions/robot_toclipboard.java
new file mode 100644
index 0000000..c701594
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/robot_toclipboard.java
@@ -0,0 +1,20 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.lib.Function;
+import com.annimon.ownlang.lib.NumberValue;
+import com.annimon.ownlang.lib.Value;
+import java.awt.Toolkit;
+import java.awt.datatransfer.StringSelection;
+
+public final class robot_toclipboard implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length != 1) throw new ArgumentsMismatchException("One argument expected");
+        
+        Toolkit.getDefaultToolkit().getSystemClipboard()
+                .setContents(new StringSelection(args[0].asString()), null);
+        return NumberValue.ZERO;
+    }
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_readln.java b/src/com/annimon/ownlang/lib/modules/functions/std_readln.java
new file mode 100644
index 0000000..0ec243a
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_readln.java
@@ -0,0 +1,14 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.lib.*;
+import java.util.Scanner;
+
+public final class std_readln implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        try (Scanner sc = new Scanner(System.in)) {
+            return new StringValue(sc.nextLine());
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_time.java b/src/com/annimon/ownlang/lib/modules/functions/std_time.java
new file mode 100644
index 0000000..37b8ce1
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_time.java
@@ -0,0 +1,13 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.lib.Function;
+import com.annimon.ownlang.lib.NumberValue;
+import com.annimon.ownlang.lib.Value;
+
+public final class std_time implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        return new NumberValue(System.currentTimeMillis());
+    }
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/robot.java b/src/com/annimon/ownlang/lib/modules/robot.java
index b61a246..7a91a03 100644
--- a/src/com/annimon/ownlang/lib/modules/robot.java
+++ b/src/com/annimon/ownlang/lib/modules/robot.java
@@ -2,6 +2,9 @@ package com.annimon.ownlang.lib.modules;
 
 import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.*;
+import com.annimon.ownlang.lib.modules.functions.robot_exec;
+import com.annimon.ownlang.lib.modules.functions.robot_fromclipboard;
+import com.annimon.ownlang.lib.modules.functions.robot_toclipboard;
 import java.awt.AWTException;
 import java.awt.Robot;
 import java.awt.event.InputEvent;
@@ -53,6 +56,10 @@ public final class robot implements Module {
             } catch (IllegalArgumentException iae) { }
             return NumberValue.ZERO;
         });
+        Functions.set("toClipboard", new robot_toclipboard());
+        Functions.set("fromClipboard", new robot_fromclipboard());
+        Functions.set("execProcess", new robot_exec(robot_exec.Mode.EXEC));
+        Functions.set("execProcessAndWait", new robot_exec(robot_exec.Mode.EXEC_AND_WAIT));
         
         Variables.set("VK_DOWN", new NumberValue(KeyEvent.VK_DOWN));
         Variables.set("VK_LEFT", new NumberValue(KeyEvent.VK_LEFT));
diff --git a/src/com/annimon/ownlang/lib/modules/std.java b/src/com/annimon/ownlang/lib/modules/std.java
index 6958732..9422a5f 100644
--- a/src/com/annimon/ownlang/lib/modules/std.java
+++ b/src/com/annimon/ownlang/lib/modules/std.java
@@ -12,10 +12,12 @@ public final class std implements Module {
     @Override
     public void init() {
         Functions.set("echo", new std_echo());
+        Functions.set("readln", new std_readln());
         Functions.set("newarray", new std_newarray());
         Functions.set("sort", new std_sort());
         Functions.set("length", new std_length());
         Functions.set("rand", new std_rand());
+        Functions.set("time", new std_time());
         Functions.set("sleep", new std_sleep());
         Functions.set("thread", new std_thread());
         
diff --git a/src/com/annimon/ownlang/parser/ast/UseStatement.java b/src/com/annimon/ownlang/parser/ast/UseStatement.java
index 39397fa..cd46154 100644
--- a/src/com/annimon/ownlang/parser/ast/UseStatement.java
+++ b/src/com/annimon/ownlang/parser/ast/UseStatement.java
@@ -22,7 +22,9 @@ public final class UseStatement implements Statement {
             final String moduleName = expression.eval().asString();
             final Module module = (Module) Class.forName(PACKAGE + moduleName).newInstance();
             module.init();
-        } catch (Exception ex) { }
+        } catch (Exception ex) {
+            throw new RuntimeException(ex);
+        }
     }
     
     @Override