diff --git a/prototypes/ptth_quic_client_gui/src/main.rs b/prototypes/ptth_quic_client_gui/src/main.rs
index 4d37f3e..e33b8e1 100644
--- a/prototypes/ptth_quic_client_gui/src/main.rs
+++ b/prototypes/ptth_quic_client_gui/src/main.rs
@@ -39,8 +39,20 @@ enum Message {
 struct GuiClient <'a> {
 	rt: &'a Runtime,
 	frame_status: Frame,
-	forwarding_instances: Vec <Option <ForwardingInstance>>,
-	gui_ports: Vec <GuiPort>,
+	ports: Vec <Port>,
+}
+
+struct Port {
+	gui: GuiPort,
+	forwarding_instance: Option <ForwardingInstance>,
+}
+
+struct GuiPort {
+	input_client_port: Input,
+	input_server_id: Input,
+	input_server_port: Input,
+	but_open: Button,
+	but_close: Button,
 }
 
 impl GuiClient <'_> {
@@ -50,7 +62,7 @@ impl GuiClient <'_> {
 		port_idx: usize,
 	) -> anyhow::Result <()>
 	{
-		let params = self.gui_ports [port_idx].get_params ()?;
+		let params = self.ports [port_idx].gui.get_params ()?;
 		
 		let _guard = self.rt.enter ();
 		let forwarding_instance = self.rt.block_on (ForwardingInstance::new (
@@ -58,16 +70,16 @@ impl GuiClient <'_> {
 			params,
 		))?;
 		
-		self.forwarding_instances [port_idx].replace (forwarding_instance);
+		self.ports [port_idx].forwarding_instance.replace (forwarding_instance);
 		
-		self.gui_ports [port_idx].set_forwarding (true);
+		self.ports [port_idx].gui.set_forwarding (true);
 		self.sync_status ();
 		
 		Ok (())
 	}
 	
 	pub fn close_port (&mut self, port_idx: usize) -> anyhow::Result <()> {
-		if let Some (old_instance) = self.forwarding_instances [port_idx].take () {
+		if let Some (old_instance) = self.ports [port_idx].forwarding_instance.take () {
 			self.rt.block_on (async {
 				old_instance.close ()
 				.await
@@ -77,15 +89,15 @@ impl GuiClient <'_> {
 			})?;
 		}
 		
-		self.gui_ports [port_idx].set_forwarding (false);
+		self.ports [port_idx].gui.set_forwarding (false);
 		self.sync_status ();
 		
 		Ok (())
 	}
 	
 	fn open_ports (&self) -> usize {
-		self.forwarding_instances.iter ()
-		.map (|x| if x.is_some () { 1 } else { 0 })
+		self.ports.iter ()
+		.map (|x| if x.forwarding_instance.is_some () { 1 } else { 0 })
 		.sum ()
 	}
 	
@@ -148,23 +160,25 @@ fn main () -> anyhow::Result <()> {
 	// y += h + margin;
 	// x = margin;
 	
-	let gui_ports = vec! [
-		gui_port_0,
-		gui_port_1,
-		gui_port_2,
-	];
-	
-	let forwarding_instances = vec! [
-		None,
-		None,
-		None,
+	let ports = vec! [
+		Port {
+			gui: gui_port_0,
+			forwarding_instance: None,
+		},
+		Port {
+			gui: gui_port_1,
+			forwarding_instance: None,
+		},
+		Port {
+			gui: gui_port_2,
+			forwarding_instance: None,
+		},
 	];
 	
 	let mut gui_client = GuiClient {
 		rt: &rt,
 		frame_status,
-		forwarding_instances,
-		gui_ports,
+		ports,
 	};
 	
 	// y += h + margin;
@@ -224,14 +238,6 @@ fn set_active <W: WidgetExt> (w: &mut W, b: bool) {
 	}
 }
 
-struct GuiPort {
-	input_client_port: Input,
-	input_server_id: Input,
-	input_server_port: Input,
-	but_open: Button,
-	but_close: Button,
-}
-
 impl GuiPort {
 	fn new (fltk_tx: fltk::app::Sender <Message>, x: &mut i32, y: i32, port_idx: usize) -> Self {
 		let margin = 10;