diff --git a/lab12/chatServer.js b/lab12/chatServer.js
index c977c96..dac61f3 100644
--- a/lab12/chatServer.js
+++ b/lab12/chatServer.js
@@ -8,24 +8,56 @@ const NAME_LEN = 10;
 var srvr = net.createServer();
 var clientList = [];
 
-srvr.on('connection', function(client) {
+srvr.on('connection', function (client) {
   client.name = calcName(client.remoteAddress, client.remotePort);
   client.write('Welcome, ' + client.name + eol);
+  clientList.push(client);
 
-  //
-  // **YOUR CODE HERE**
-  //
-  // First, add the client to clientList.
-  //
-  // Next, add a listener to the client for a 'data' event.
-  // This event means that the client typed something in.
-  // Broadcast that message to all **other** clients in clientList.
-  //
-  // For extra challenges, try adding the following functionality:
-  // 1) Typing '\list' will list the names of all other users.
-  // 2) Typing '\rename <newname>' will let the user specify a new name for himself/herself.
-  // 3) Typing '\private <name> <msg>' will send a message only to the specified user.
-
+  client.on("data", function (data) {
+    if (data.at(0) !== "\\".charCodeAt(0)) {
+      broadcast(data, client);
+      return;
+    }
+    command = data
+      .subarray(1)
+      .toString()
+      .split(/[\s\r\n]+/)
+      .filter((s) => s.length > 0);
+    console.log(command);
+    switch (command[0]) {
+      case "list":
+        const list = clientList.map((c) => c.name).join(eol);
+        client.write("Connected Users" + eol + list + eol);
+        break;
+      case "rename":
+        if (command.length !== 2) {
+          client.write("Usage: \\rename <newname>" + eol);
+          break;
+        }
+        const oldName = client.name;
+        client.name = command[1];
+        client.write("You are now known as " + client.name + eol);
+        broadcast(oldName + " is now known as " + client.name + eol, client);
+        break;
+      case "private":
+        if (command.length < 3) {
+          client.write("Usage: \\private <name> <msg>" + eol);
+          break;
+        }
+        const targetName = command[1];
+        const msg = command.slice(2).join(" ");
+        const targetClient = clientList.find((c) => c.name === targetName);
+        if (targetClient) {
+          targetClient.write("(Private) " + client.name + " says " + msg + eol);
+          client.write("(Private) To " + targetClient.name + ": " + msg + eol);
+        } else {
+          client.write("User " + targetName + " not found." + eol);
+        }
+        break;
+      default:
+        client.write("Unknown command: " + command[0] + eol);
+    }
+  });
 });
 
 function calcName(remoteAddress, remotePort) {
@@ -34,6 +66,14 @@ function calcName(remoteAddress, remotePort) {
   return h.substring(0, NAME_LEN);
 }
 
+function broadcast(data, client) {
+  for (var i in clientList) {
+    if (client !== clientList[i]) {
+      clientList[i].write(client.name + " says " + data);
+    }
+  }
+}
+
 srvr.listen(9000);