diff --git a/examples/chat/client/main.go b/examples/chat/client/main.go
index 6be68df..5ed7e8a 100644
--- a/examples/chat/client/main.go
+++ b/examples/chat/client/main.go
@@ -42,11 +42,11 @@ func main() {
 			break
 		}
 		switch message := message.(type) {
-		case *chat.MessageChat:
+		case chat.MessageChat:
 			fmt.Fprintf(os.Stdout, "%s: %s\n", message.Nickname, message.Content)
-		case *chat.MessageJoinNotify:
+		case chat.MessageJoinNotify:
 			fmt.Fprintf(os.Stdout, "(i) %s joined the room\n", message.Nickname)
-		case *chat.MessageLeaveNotify:
+		case chat.MessageLeaveNotify:
 			fmt.Fprintf(os.Stdout, "(i) %s left the room\n", message.Nickname)
 		}
 	}
diff --git a/examples/chat/server/main.go b/examples/chat/server/main.go
index 444cb7b..abf17e8 100644
--- a/examples/chat/server/main.go
+++ b/examples/chat/server/main.go
@@ -98,20 +98,27 @@ func (this *client) transTalk(trans hopp.Trans, initial *chat.MessageJoin) error
 	err := this.joinRoom(trans, room)
 	if err != nil { return err }
 	defer this.leaveRoom(trans, room)
+
+	_, err = chat.Send(trans, &chat.MessageChat {
+		Content: "(i) joined " + room,
+		Nickname: "SYSTEM",
+	})
+	if err != nil { return err }
+	
 	for {
 		message, _, err := chat.Receive(trans)
 		if err != nil { return err }
 		switch message := message.(type) {
-		case *chat.MessageChat:
+		case chat.MessageChat:
 			err := this.handleMessageChat(trans, room, message)
 			if err != nil { return err }
-		case *chat.MessageError:
-			return message
+		case chat.MessageError:
+			return &message
 		}
 	}
 }
 
-func (this *client) handleMessageChat(trans hopp.Trans, room string, message *chat.MessageChat) error {
+func (this *client) handleMessageChat(trans hopp.Trans, room string, message chat.MessageChat) error {
 	log.Printf("(). %s #%s: %s", this.nickname, room, message.Content)
 	clients, done := clients.RBorrow()
 	defer done()
@@ -124,11 +131,11 @@ func (this *client) handleMessageChat(trans hopp.Trans, room string, message *ch
 	return nil
 }
 
-func (this *client) relayMessage(room string, message *chat.MessageChat) error {
+func (this *client) relayMessage(room string, message chat.MessageChat) error {
 	rooms, done := this.rooms.RBorrow()
 	defer done()
 	if trans, ok := rooms[room]; ok {
-		_, err := chat.Send(trans, message)
+		_, err := chat.Send(trans, &message)
 		if err != nil {
 			return fmt.Errorf("could not relay message: %w", err)
 		}
diff --git a/examples/ping/client/main.go b/examples/ping/client/main.go
index 2bff04d..e9167ba 100644
--- a/examples/ping/client/main.go
+++ b/examples/ping/client/main.go
@@ -25,12 +25,11 @@ func main() {
 
 	go func() {
 		message := ping.MessagePing(0)
-		for {
+		for _ = range time.Tick(time.Second) {
 			log.Printf("<-- ping (%d)", message)
 			_, err := ping.Send(trans, &message)
 			handleErr(1, err)
 			message ++
-			time.Sleep(time.Second)
 		}
 	}()
 
@@ -44,7 +43,7 @@ func main() {
 			break
 		}
 		switch message := message.(type) {
-		case *ping.MessagePong:
+		case ping.MessagePong:
 			log.Printf("--> pong (%d) from %v", message, address)
 		}
 	}