diff --git a/prototypes/quic_demo/src/bin/client_gui.rs b/prototypes/quic_demo/src/bin/client_gui.rs
index 4abafda..a8752d6 100644
--- a/prototypes/quic_demo/src/bin/client_gui.rs
+++ b/prototypes/quic_demo/src/bin/client_gui.rs
@@ -45,7 +45,9 @@ fn main () -> anyhow::Result <()> {
 	let mut x = margin;
 	let mut y = margin;
 	
-	let frame_status;
+	let mut frame_status;
+	
+	
 	let mut input_client_port;
 	let mut input_server_id;
 	let mut input_server_port;
@@ -53,7 +55,7 @@ fn main () -> anyhow::Result <()> {
 	let mut but_close;
 	
 	{
-		frame_status = Frame::new (10, 10, 800 - 20, 30, "0 ports forwarded");
+		frame_status = Frame::new (10, 10, 800 - 20, 30, "Forwarding 0 ports");
 	}
 	
 	y += h + margin;
@@ -110,6 +112,14 @@ fn main () -> anyhow::Result <()> {
 		set_active (&mut but_close, false);
 	}
 	
+	let mut gui_port = GuiPort {
+		input_client_port,
+		input_server_id,
+		input_server_port,
+		but_open,
+		but_close,
+	};
+	
 	// y += h + margin;
 	
 	wind.end ();
@@ -137,31 +147,25 @@ fn main () -> anyhow::Result <()> {
 	while app.wait () {
 		match fltk_rx.recv () {
 			Some (Message::OpenPort) => {
-				let connection_p2_p3 = connection_p2_p3.clone ();
-				let client_tcp_port = u16::from_str (&input_client_port.value ())?;
-				let server_id = input_server_id.value ();
-				let server_tcp_port = u16::from_str (&input_server_port.value ())?;
-				let (shutdown_flag, shutdown_flag_rx) = tokio::sync::watch::channel (true);
-				
-				let task = rt.spawn (async move {
-					forward_port (
+				if let Ok (params) = gui_port.get_params () {
+					let connection_p2_p3 = connection_p2_p3.clone ();
+					let (shutdown_flag, shutdown_flag_rx) = tokio::sync::watch::channel (true);
+					
+					let task = rt.spawn (forward_port (
 						connection_p2_p3,
-						client_tcp_port,
-						server_id, 
-						server_tcp_port,
+						params,
 						shutdown_flag_rx
-					).await
-				});
-				
-				forwarding_instance.replace (ForwardingInstance {
-					task,
-					shutdown_flag,
-				});
-				
-				set_active (&mut but_open, false);
-				set_active (&mut but_close, true);
-				but_open.set (true);
-				but_close.set (false);
+					));
+					
+					forwarding_instance.replace (ForwardingInstance {
+						task,
+						shutdown_flag,
+					});
+					
+					gui_port.set_forwarding (true);
+					
+					frame_status.set_label ("Forwarding 1 port");
+				}
 			},
 			Some (Message::ClosePort) => {
 				if let Some (mut old_instance) = forwarding_instance.take () {
@@ -172,10 +176,8 @@ fn main () -> anyhow::Result <()> {
 					})?;
 				}
 				
-				set_active (&mut but_open, true);
-				set_active (&mut but_close, false);
-				but_open.set (false);
-				but_close.set (true);
+				gui_port.set_forwarding (false);
+				frame_status.set_label ("Forwarding 0 ports");
 			},
 			None => (),
 		}
@@ -200,12 +202,16 @@ struct ForwardingInstance {
 
 async fn forward_port (
 	connection_p2_p3: quinn::Connection,
-	client_tcp_port: u16,
-	server_id: String,
-	server_tcp_port: u16,
+	params: ForwardingParams,
 	shutdown_flag_rx: tokio::sync::watch::Receiver <bool>,
 ) -> anyhow::Result <()>
 {
+	let ForwardingParams {
+		client_tcp_port,
+		server_id,
+		server_tcp_port,
+	} = params;
+	
 	let listener = TcpListener::bind (("127.0.0.1", client_tcp_port)).await?;
 	
 	trace! ("Accepting local TCP connections from P1 on {}", client_tcp_port);
@@ -307,3 +313,43 @@ async fn handle_p1 (
 	
 	Ok (())
 }
+
+struct GuiPort {
+	input_client_port: Input,
+	input_server_id: Input,
+	input_server_port: Input,
+	but_open: Button,
+	but_close: Button,
+}
+
+struct ForwardingParams {
+	client_tcp_port: u16,
+	server_id: String,
+	server_tcp_port: u16,
+}
+
+impl GuiPort {
+	fn get_params (&self) -> anyhow::Result <ForwardingParams>
+	{
+		let client_tcp_port = u16::from_str (&self.input_client_port.value ())?;
+		let server_id = self.input_server_id.value ();
+		let server_tcp_port = u16::from_str (&self.input_server_port.value ())?;
+		
+		Ok (ForwardingParams {
+			client_tcp_port,
+			server_id,
+			server_tcp_port,
+		})
+	}
+	
+	fn set_forwarding (&mut self, x: bool) {
+		set_active (&mut self.input_client_port, !x);
+		set_active (&mut self.input_server_id, !x);
+		set_active (&mut self.input_server_port, !x);
+		set_active (&mut self.but_open, !x);
+		set_active (&mut self.but_close, x);
+		
+		self.but_open.set (x);
+		self.but_close.set (!x);
+	}
+}