diff --git a/chat_logic.py b/chat_logic.py
new file mode 100644
index 0000000..7125031
--- /dev/null
+++ b/chat_logic.py
@@ -0,0 +1,67 @@
+import os
+import json
+import time
+import threading
+
+CHAT_FILE = "global_chat.json"
+
+class ChatNetwork:
+    def __init__(self, ui_callback):
+        self.ui_callback = ui_callback
+        self.my_pid = os.getpid()
+        self.is_running = True
+        self.last_read_index = 0 
+
+        if not os.path.exists(CHAT_FILE):
+            with open(CHAT_FILE, 'w') as f:
+                json.dump([], f)
+
+    def start_server(self):
+        """Inicia el hilo que lee el chat constantemente."""
+        threading.Thread(target=self._monitor_chat, daemon=True).start()
+
+    def _monitor_chat(self):
+        """Lee el archivo global y muestra solo los mensajes nuevos."""
+        while self.is_running:
+            try:
+                if os.path.exists(CHAT_FILE):
+                    with open(CHAT_FILE, 'r') as f:
+                        messages = json.load(f)
+                        
+                        if len(messages) > self.last_read_index:
+                            new_msgs = messages[self.last_read_index:]
+                            
+                            for msg in new_msgs:
+                                mi_prefijo = f"PID {self.my_pid}:"
+                                
+                                if msg.startswith(mi_prefijo):
+                                    mensaje_visual = msg.replace(mi_prefijo, "Yo:")
+                                else:
+                                    mensaje_visual = msg
+                                    
+                                self.ui_callback(mensaje_visual)
+                            
+                            self.last_read_index = len(messages)
+            except Exception:
+                pass 
+            time.sleep(0.5)
+
+    def send_message(self, message):
+        """Añade un mensaje al archivo global."""
+        try:
+            if os.path.exists(CHAT_FILE):
+                with open(CHAT_FILE, 'r') as f:
+                    data = json.load(f)
+            else:
+                data = []
+            
+            data.append(f"PID {self.my_pid}: {message}")
+            
+            with open(CHAT_FILE, 'w') as f:
+                json.dump(data, f)
+            return True
+        except Exception:
+            return False
+
+    def stop(self):
+        self.is_running = False
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