diff --git a/prototypes/ptth_quic_client_gui/src/main.rs b/prototypes/ptth_quic_client_gui/src/main.rs
index 544bd65..438184d 100644
--- a/prototypes/ptth_quic_client_gui/src/main.rs
+++ b/prototypes/ptth_quic_client_gui/src/main.rs
@@ -10,6 +10,7 @@ use fltk::{
 	window::Window
 };
 use structopt::StructOpt;
+use tokio::runtime::Runtime;
 
 use quic_demo::{
 	client_proxy::*,
@@ -35,9 +36,50 @@ enum Message {
 	ClosePort (usize),
 }
 
+struct GuiClient <'a> {
+	rt: &'a Runtime,
+	frame_status: Frame,
+	forwarding_instances: Vec <Option <ForwardingInstance>>,
+	gui_ports: Vec <GuiPort>,
+}
+
+impl GuiClient <'_> {
+	pub fn open_port (
+		&mut self, 
+		connection_p2_p3: quinn::Connection, 
+		port_idx: usize,
+	) -> anyhow::Result <()>
+	{
+		let params = self.gui_ports [port_idx].get_params ()?;
+		
+		let _guard = self.rt.enter ();
+		self.forwarding_instances [port_idx].replace (ForwardingInstance::new (
+			connection_p2_p3,
+			params,
+		));
+		
+		self.gui_ports [port_idx].set_forwarding (true);
+		
+		self.frame_status.set_label ("Forwarding 1 port");
+		
+		Ok (())
+	}
+	
+	pub fn close_port (&mut self, port_idx: usize) -> anyhow::Result <()> {
+		if let Some (old_instance) = self.forwarding_instances [port_idx].take () {
+			self.rt.block_on (old_instance.close ())?;
+		}
+		
+		self.gui_ports [port_idx].set_forwarding (false);
+		self.frame_status.set_label ("Forwarding 0 ports");
+		
+		Ok (())
+	}
+}
+
 fn main () -> anyhow::Result <()> {
 	tracing_subscriber::fmt::init ();
-	let rt = tokio::runtime::Runtime::new ()?;
+	let rt = Runtime::new ()?;
 	
 	let opt = Opt::from_args ();
 	
@@ -53,7 +95,7 @@ fn main () -> anyhow::Result <()> {
 	let mut x = margin;
 	let mut y = margin;
 	
-	let mut frame_status = Frame::new (x, y, 800 - 20, h, "Forwarding 0 ports");
+	let frame_status = Frame::new (x, y, 800 - 20, h, "Forwarding 0 ports");
 	
 	y += h + margin;
 	x = margin;
@@ -87,18 +129,25 @@ fn main () -> anyhow::Result <()> {
 	// y += h + margin;
 	// x = margin;
 	
-	let mut gui_ports = vec! [
+	let gui_ports = vec! [
 		gui_port_0,
 		gui_port_1,
 		gui_port_2,
 	];
 	
-	let mut forwarding_instances = vec! [
+	let forwarding_instances = vec! [
 		None,
 		None,
 		None,
 	];
 	
+	let mut gui_client = GuiClient {
+		rt: &rt,
+		frame_status,
+		forwarding_instances,
+		gui_ports,
+	};
+	
 	// y += h + margin;
 	
 	wind.end ();
@@ -132,27 +181,13 @@ fn main () -> anyhow::Result <()> {
 	while app.wait () {
 		match fltk_rx.recv () {
 			Some (Message::OpenPort (port_idx)) => {
-				if let Ok (params) = gui_ports [port_idx].get_params () {
-					let connection_p2_p3 = connection_p2_p3.clone ();
-					
-					let _guard = rt.enter ();
-					forwarding_instances [port_idx].replace (ForwardingInstance::new (
-						connection_p2_p3,
-						params,
-					));
-					
-					gui_ports [port_idx].set_forwarding (true);
-					
-					frame_status.set_label ("Forwarding 1 port");
-				}
+				match gui_client.open_port (connection_p2_p3.clone (), port_idx) {
+					Err (e) => error! ("{:?}", e),
+					_ => (),
+				};
 			},
 			Some (Message::ClosePort (port_idx)) => {
-				if let Some (old_instance) = forwarding_instances [port_idx].take () {
-					rt.block_on (old_instance.close ())?;
-				}
-				
-				gui_ports [port_idx].set_forwarding (false);
-				frame_status.set_label ("Forwarding 0 ports");
+				gui_client.close_port (port_idx)?;
 			},
 			None => (),
 		}