diff --git a/turtle/noblocking_turtle_shell.py b/turtle/noblocking_turtle_shell.py
index 394fe37..035fcd5 100644
--- a/turtle/noblocking_turtle_shell.py
+++ b/turtle/noblocking_turtle_shell.py
@@ -3,6 +3,7 @@ import threading
 
 from queue import Queue
 
+import turtle
 from equipment.turtle_device import TurtleDevice
 
 
@@ -11,25 +12,62 @@ class TurtleDeviceThread(threading.Thread):
     def __init__(self):
         super().__init__()
         self.device = TurtleDevice()
-        self.queue = Queue()
+        self.queue = Queue[tuple]()
+
+        self.device.open()
+        self.device.execute("speed", 1)
+
+    def run(self):
+        while True:
+            action, args, kwargs = self.queue.get()
+            self.device.execute(action, *args, **kwargs)
+            self.queue.task_done()
+
+    def add_task(self, action, *args, **kwargs):
+        self.queue.put((action, args, kwargs))
 
 
 class NoBlockingTurtleShell(cmd.Cmd):
-    intro = 'Welcome to the turtle shell.   Type help or ? to list commands.\n'
-    prompt = '(turtle) '
+    intro = "Welcome to the turtle shell.   Type help or ? to list commands.\n"
+    prompt = "(turtle) "
     file = None
 
     def __init__(self, turtle_thread: TurtleDeviceThread):
-        pass  # TODO(Homework 4)
+        super().__init__()
+        self.turtle_thread = turtle_thread
+
+    @property
+    def turtle_device(self):
+        return self.turtle_thread.device
 
     def do_execute(self, arg):
-        pass  # TODO(Homework 4)
+        print(arg)
+        command, number = tuple(arg.split())
+        assert number.isdecimal()
+        self.turtle_thread.add_task(command, int(number))
 
     def do_exit(self, arg):
-        pass  # TODO(Homework 4)
+        self.turtle_device.close()
+        self.close()
+
+    def precmd(self, line):
+        line = line.lower()
+        if self.file and "playback" not in line:
+            print(line, file=self.file)
+        return line
+
+    def close(self):
+        if self.file:
+            self.file.close()
+            self.file = None
 
 
-if __name__ == '__main__':
+import tkinter
+
+if __name__ == "__main__":
     turtle_thread = TurtleDeviceThread()
     # TODO(Homework 4: Correct start thread)
-    NoBlockingTurtleShell(turtle_thread).cmdloop()
\ No newline at end of file
+    turtle_thread.daemon = True
+    turtle_thread.start()
+    NoBlockingTurtleShell(turtle_thread).cmdloop()
+    turtle_thread.join()