diff --git a/Linux/.vscode/settings.json b/Linux/.vscode/settings.json
index 786d4d3..f21c8f7 100644
--- a/Linux/.vscode/settings.json
+++ b/Linux/.vscode/settings.json
@@ -1,3 +1,4 @@
 {
-    "nixEnvSelector.nixFile": "${workspaceFolder}/shell.nix"
+    "nixEnvSelector.nixFile": "${workspaceFolder}/shell.nix",
+    "files.trimTrailingWhitespace": true
 }
\ No newline at end of file
diff --git a/Linux/src/actions/mod.rs b/Linux/src/actions/mod.rs
index 85cdecb..2fdd83a 100644
--- a/Linux/src/actions/mod.rs
+++ b/Linux/src/actions/mod.rs
@@ -1,17 +1,22 @@
 pub mod pipewire;
 
-use crate::registry::MkRegistry;
+use crate::registry::Registry;
 use crate::registry::RegistryItem;
 use crate::util::unique_id::UniqueId;
 
 
-pub struct MkAction
+pub struct ActionRegistryItem
 {
     pub unique_id: UniqueId
 }
 
 
-impl RegistryItem for MkAction
+pub trait Action
+{
+}
+
+
+impl RegistryItem for ActionRegistryItem
 {
     fn unique_id(&self) -> UniqueId
     {
@@ -26,7 +31,7 @@ impl RegistryItem for MkAction
 
 
 
-pub fn register(registry: &mut MkRegistry<MkAction>)
+pub fn register(registry: &mut Registry<ActionRegistryItem>)
 {
     pipewire::register(registry);
 }
\ No newline at end of file
diff --git a/Linux/src/actions/pipewire/mod.rs b/Linux/src/actions/pipewire/mod.rs
index b59729e..cbef414 100644
--- a/Linux/src/actions/pipewire/mod.rs
+++ b/Linux/src/actions/pipewire/mod.rs
@@ -1,13 +1,13 @@
-use crate::registry::MkRegistry;
+use crate::registry::Registry;
 use crate::util::unique_id::UniqueId;
-use super::MkAction;
+use super::ActionRegistryItem;
 
 pub mod set_volume;
 
 
-pub fn register(registry: &mut MkRegistry<MkAction>)
+pub fn register(registry: &mut Registry<ActionRegistryItem>)
 {
-    registry.register(MkAction 
+    registry.register(ActionRegistryItem
     {
         unique_id: UniqueId::new("pipewire.set_volume")
     });
diff --git a/Linux/src/config/mod.rs b/Linux/src/config/mod.rs
index f9b433b..19793dd 100644
--- a/Linux/src/config/mod.rs
+++ b/Linux/src/config/mod.rs
@@ -49,15 +49,20 @@ impl ConfigManager
     pub fn get_writer(&self, name: &ConfigName) -> Result<impl Write, Error>
     {
         let path = Path::join(&self.root, name.as_str());
-        if !path.exists()
+        let parent = Path::parent(&path);
+
+        if let Some(parent) = parent
         {
-            match std::fs::create_dir_all(path.clone())
+            if !parent.exists()
             {
-                Ok(_v) => (),
-                Err(e) => return Err(e)
+                match std::fs::create_dir_all(parent)
+                {
+                    Ok(_v) => (),
+                    Err(e) => return Err(e)
+                }
             }
         }
-
+        
         std::fs::File::create(path)
     }
 }
diff --git a/Linux/src/devices/emulator/mod.rs b/Linux/src/devices/emulator/mod.rs
index 0f39949..e84cb03 100644
--- a/Linux/src/devices/emulator/mod.rs
+++ b/Linux/src/devices/emulator/mod.rs
@@ -1,24 +1,58 @@
-use crate::registry::MkRegistry;
+use emulatorwindow::EmulatorWindow;
+use relm4::{component::Connector, ComponentController};
+use relm4::Component;
+use relm4::gtk::prelude::*;
+
+use crate::registry::Registry;
 use crate::util::unique_id::UniqueId;
-use super::MkDevice;
+use super::{Device, DeviceRegistryItem};
 
 
 pub mod emulatorwindow;
 
 
-
-
-pub fn register(registry: &mut MkRegistry<MkDevice>)
+pub struct EmulatorWindowDevice
 {
-    registry.register(MkDevice {
-        unique_id: UniqueId::new("emulator")
-    });
+    window: Option<Connector<EmulatorWindow>>
 }
 
-/*
-    let app = relm4::main_application();
-    let builder = EmulatorWindow::builder();
-    app.add_window(&builder.root);
 
-    builder.launch(()).detach_runtime();
-*/
\ No newline at end of file
+impl EmulatorWindowDevice
+{
+    fn new() -> Self
+    {
+        EmulatorWindowDevice
+        {
+            window: None
+        }
+    }
+}
+
+
+impl Device for EmulatorWindowDevice
+{
+    fn activate(&mut self)
+    {
+        if self.window.is_some() { return }
+
+        let builder = EmulatorWindow::builder();
+        self.window = Some(builder.launch({}));
+    }
+
+
+    fn deactivate(&mut self)
+    {
+        let Some(window) = self.window.take() else { return };
+
+        window.widget().close();
+    }
+}
+
+
+pub fn register(registry: &mut Registry<DeviceRegistryItem>)
+{
+    registry.register(DeviceRegistryItem {
+        unique_id: UniqueId::new("emulator"),
+        factory: || Box::new(EmulatorWindowDevice::new())
+    });
+}
\ No newline at end of file
diff --git a/Linux/src/devices/mod.rs b/Linux/src/devices/mod.rs
index 0cd95d7..a1a4736 100644
--- a/Linux/src/devices/mod.rs
+++ b/Linux/src/devices/mod.rs
@@ -2,18 +2,26 @@ pub mod emulator;
 pub mod serial_min;
 
 
-use crate::registry::MkRegistry;
+use crate::registry::Registry;
 use crate::registry::RegistryItem;
 use crate::util::unique_id::UniqueId;
 
 
-pub struct MkDevice
+pub struct DeviceRegistryItem
 {
-    pub unique_id: UniqueId
+    pub unique_id: UniqueId,
+    pub factory: fn() -> Box<dyn Device>
 }
 
 
-impl RegistryItem for MkDevice
+pub trait Device
+{
+    fn activate(&mut self);
+    fn deactivate(&mut self);
+}
+
+
+impl RegistryItem for DeviceRegistryItem
 {
     fn unique_id(&self) -> UniqueId
     {
@@ -28,7 +36,7 @@ impl RegistryItem for MkDevice
 
 
 
-pub fn register(registry: &mut MkRegistry<MkDevice>)
+pub fn register(registry: &mut Registry<DeviceRegistryItem>)
 {
     emulator::register(registry);
     serial_min::register(registry);
diff --git a/Linux/src/devices/serial_min/mod.rs b/Linux/src/devices/serial_min/mod.rs
index 61f3eb2..32abf8d 100644
--- a/Linux/src/devices/serial_min/mod.rs
+++ b/Linux/src/devices/serial_min/mod.rs
@@ -1,11 +1,33 @@
-use crate::registry::MkRegistry;
+use crate::registry::Registry;
 use crate::util::unique_id::UniqueId;
-use super::MkDevice;
+use super::{Device, DeviceRegistryItem};
 
 
-pub fn register(registry: &mut MkRegistry<MkDevice>)
+pub struct SerialMinDevice
 {
-    registry.register(MkDevice {
-        unique_id: UniqueId::new("serial_min")
+
+}
+
+
+impl Device for SerialMinDevice
+{
+    fn activate(&mut self)
+    {
+        //todo!()
+    }
+
+
+    fn deactivate(&mut self)
+    {
+        //todo!()
+    }
+}
+
+
+pub fn register(registry: &mut Registry<DeviceRegistryItem>)
+{
+    registry.register(DeviceRegistryItem {
+        unique_id: UniqueId::new("serial_min"),
+        factory: || Box::new(SerialMinDevice {})
     });
 }
\ No newline at end of file
diff --git a/Linux/src/main.rs b/Linux/src/main.rs
index 82339a6..d09e1e1 100644
--- a/Linux/src/main.rs
+++ b/Linux/src/main.rs
@@ -1,6 +1,7 @@
+use std::cell::RefCell;
 use std::rc::Rc;
 use env_logger::Env;
-use mainwindow::MainWindowViewModel;
+use mainwindow::MainWindowInit;
 use orchestrator::Orchestrator;
 use relm4::prelude::*;
 
@@ -27,11 +28,13 @@ fn main()
 
     relm4_icons::initialize_icons();
 
-    let orchestrator = Rc::new(Orchestrator::new());
+    let orchestrator = Rc::new(RefCell::new(Orchestrator::new()));
 
     let app = RelmApp::new("com.github.mvrens.massiveknob");
-    app.run::<mainwindow::MainWindow>(MainWindowViewModel
+    app.run::<mainwindow::MainWindow>(MainWindowInit
     {
         orchestrator: Rc::clone(&orchestrator)
     });
+
+    orchestrator.borrow_mut().finalize();
 }
\ No newline at end of file
diff --git a/Linux/src/mainwindow.rs b/Linux/src/mainwindow.rs
index 8aadf57..3cdf50e 100644
--- a/Linux/src/mainwindow.rs
+++ b/Linux/src/mainwindow.rs
@@ -1,25 +1,31 @@
+use std::cell::RefCell;
 use std::rc::Rc;
+use gtk::glib::clone;
 use gtk::prelude::*;
 use relm4::prelude::*;
 
-use crate::{devices::MkDevice, orchestrator::Orchestrator, registry::RegistryItem, util::unique_id::UniqueId};
+use crate::orchestrator::Orchestrator;
+use crate::registry::RegistryItem;
+use crate::util::unique_id::UniqueId;
 
 pub struct MainWindow
-{ 
+{
+    orchestrator: Rc<RefCell<Orchestrator>>,
+    devices_sorted: Vec<SortedDevice>
 }
 
 
-pub struct MainWindowViewModel
+pub struct MainWindowInit
 {
-    pub orchestrator: Rc<Orchestrator>
+    pub orchestrator: Rc<RefCell<Orchestrator>>
 }
 
 
-impl std::fmt::Debug for MainWindowViewModel
+impl std::fmt::Debug for MainWindowInit
 {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result 
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
     {
-        f.debug_struct("MainWindowViewModel")
+        f.debug_struct("MainWindowInit")
             // Skip orchestrator
             .finish()
     }
@@ -29,25 +35,25 @@ impl std::fmt::Debug for MainWindowViewModel
 #[derive(Debug)]
 pub enum MainWindowMsg
 {
+    DeviceChanged(usize)
 }
 
 
 pub struct MainWindowWidgets
 {
-    device: MainWindowDeviceWidgets
+    _device: MainWindowDeviceWidgets
 }
 
 
 pub struct MainWindowDeviceWidgets
 {
-    devices_sorted: Vec<SortedDevice>,
-    devices_combobox: gtk::ComboBoxText
+    _devices_combobox: gtk::ComboBoxText
 }
 
 
 impl SimpleComponent for MainWindow
 {
-    type Init = MainWindowViewModel;
+    type Init = MainWindowInit;
     type Input = MainWindowMsg;
     type Output = ();
     type Root = gtk::Window;
@@ -61,67 +67,19 @@ impl SimpleComponent for MainWindow
             .title(t!("mainwindow.title"))
             .default_width(500)
             .default_height(500)
-            .build()   
+            .build()
     }
 
 
-    fn init(data: Self::Init, window: Self::Root, _sender: ComponentSender<Self>, ) -> ComponentParts<Self> 
+    fn init(data: Self::Init, window: Self::Root, sender: ComponentSender<Self>) -> ComponentParts<Self>
     {
-        let orchestrator = data.orchestrator.as_ref();
-
-        let model = MainWindow {};
-        let widgets = Self::init_ui(&window, &orchestrator);
-
-        ComponentParts { model, widgets }
-    }
-
-
-    fn update(&mut self, msg: Self::Input, _sender: ComponentSender<Self>) 
-    {
-        match msg 
         {
+            let mut init_orchestrator = data.orchestrator.borrow_mut();
+            init_orchestrator.initialize();
         }
-    }    
-}
 
 
-
-impl MainWindow
-{
-    fn init_ui(window: &gtk::Window, orchestrator: &Orchestrator) -> MainWindowWidgets
-    {
-        let tabs = gtk::Notebook::builder().build();
-        window.set_child(Some(&tabs));
-
-        MainWindowWidgets
-        {
-            device: Self::init_device_tab(&tabs, &orchestrator)
-            //Self::new_box_tab(&tabs, "mainwindow.tab.analoginputs");
-            //Self::new_box_tab(&tabs, "mainwindow.tab.digitalinputs");
-            //Self::add_box_tab(&tabs, "mainwindow.tab.analogoutputs");
-            //Self::add_box_tab(&tabs, "mainwindow.tab.digitaloutputs");
-        }
-    }
-
-
-    fn init_device_tab(tabs: &gtk::Notebook, orchestrator: &Orchestrator) -> MainWindowDeviceWidgets
-    {
-        let tab = Self::new_box_tab(&tabs, "mainwindow.tab.device");
-
-        let label = gtk::Label::builder()
-            .label(t!("mainwindow.deviceType.label"))
-            .halign(gtk::Align::Start)
-            .build();
-
-        tab.append(&label);
-
-
-
-        let devices_combobox = gtk::ComboBoxText::builder()                                
-            .build();
-
-        tab.append(&devices_combobox);
-
+        let orchestrator = data.orchestrator.borrow();
 
         let mut devices_sorted: Vec<SortedDevice> = orchestrator.devices()
             .map(|device| SortedDevice
@@ -133,14 +91,114 @@ impl MainWindow
 
         devices_sorted.sort_by(|a, b| a.name.to_lowercase().cmp(&b.name.to_lowercase()));
 
-        let current_device_id = orchestrator.current_device_id();
+
+        let model = MainWindow
+        {
+            orchestrator: data.orchestrator.clone(),
+            devices_sorted
+        };
+
+        let widgets = MainWindowBuilder::new(&window, &model, &sender).build();
+
+        ComponentParts { model, widgets }
+    }
 
 
-        for (index, device) in devices_sorted.iter().enumerate()
+    fn update(&mut self, msg: Self::Input, _sender: ComponentSender<Self>)
+    {
+        match msg
+        {
+            MainWindowMsg::DeviceChanged(index) =>
+            {
+                let mut orchestrator = self.orchestrator.borrow_mut();
+                let device = &self.devices_sorted[index];
+
+                orchestrator.set_current_device_id(device.unique_id.clone());
+            }
+        }
+    }
+}
+
+
+struct MainWindowBuilder<'a>
+{
+    window: &'a gtk::Window,
+    model: &'a MainWindow,
+    sender: &'a ComponentSender<MainWindow>
+}
+
+
+impl<'a> MainWindowBuilder<'a>
+{
+    fn new(window: &'a gtk::Window, model: &'a MainWindow, sender: &'a ComponentSender<MainWindow>) -> Self
+    {
+        Self
+        {
+            window,
+            model,
+            sender
+        }
+    }
+
+
+    fn build(&self) -> MainWindowWidgets
+    {
+        let tabs = gtk::Notebook::builder().build();
+        self.window.set_child(Some(&tabs));
+
+        MainWindowWidgets
+        {
+            _device: self.init_device_tab(&tabs)
+            //Self::new_box_tab(&tabs, "mainwindow.tab.analoginputs");
+            //Self::new_box_tab(&tabs, "mainwindow.tab.digitalinputs");
+            //Self::add_box_tab(&tabs, "mainwindow.tab.analogoutputs");
+            //Self::add_box_tab(&tabs, "mainwindow.tab.digitaloutputs");
+        }
+    }
+
+
+    fn init_device_tab(&self, tabs: &gtk::Notebook) -> MainWindowDeviceWidgets
+    {
+        let sender = self.sender;
+        let tab = Self::new_box_tab(&tabs, "mainwindow.tab.device");
+
+        let label = gtk::Label::builder()
+            .label(t!("mainwindow.deviceType.label"))
+            .halign(gtk::Align::Start)
+            .build();
+
+        tab.append(&label);
+
+
+
+        let devices_combobox = gtk::ComboBoxText::builder()
+            .build();
+
+        let devices_combobox_cloned = devices_combobox.clone();
+
+        devices_combobox.connect_changed(clone!(
+            @strong sender => move |_|
+            {
+                if let Some(active_index) = devices_combobox_cloned.active()
+                {
+                    if let Ok(active_index_usize) = usize::try_from(active_index)
+                    {
+                        sender.input(MainWindowMsg::DeviceChanged(active_index_usize));
+                    }
+                }
+            }));
+
+        tab.append(&devices_combobox);
+
+
+        let current_device_id = self.model.orchestrator.borrow().current_device_id();
+
+
+        for (index, device) in self.model.devices_sorted.iter().enumerate()
         {
             devices_combobox.append_text(device.name.as_str());
 
-            if let Some(device_id) = current_device_id
+            if let Some(device_id) = current_device_id.clone()
             {
                 if device_id == device.unique_id
                 {
@@ -152,12 +210,11 @@ impl MainWindow
 
         MainWindowDeviceWidgets
         {
-            devices_sorted,
-            devices_combobox
+            _devices_combobox: devices_combobox
         }
     }
 
-    
+
     fn new_box_tab(notebook: &gtk::Notebook, title_key: &str) -> gtk::Box
     {
         let tab = gtk::Box::builder()
diff --git a/Linux/src/orchestrator/mod.rs b/Linux/src/orchestrator/mod.rs
index 7c5735a..e3882ea 100644
--- a/Linux/src/orchestrator/mod.rs
+++ b/Linux/src/orchestrator/mod.rs
@@ -1,10 +1,10 @@
 use crate::actions;
-use crate::actions::MkAction;
+use crate::actions::ActionRegistryItem;
 use crate::config::json::JsonConfigManager;
 use crate::config::{ConfigManager, ConfigName};
-use crate::devices;
-use crate::devices::MkDevice;
-use crate::registry::MkRegistry;
+use crate::devices::{self, Device};
+use crate::devices::DeviceRegistryItem;
+use crate::registry::Registry;
 use crate::util::unique_id::UniqueId;
 
 
@@ -15,11 +15,14 @@ pub struct Orchestrator
 {
     config_manager: ConfigManager,
 
-    device_registry: MkRegistry<MkDevice>,
-    action_registry: MkRegistry<MkAction>,
+    device_registry: Registry<DeviceRegistryItem>,
+    action_registry: Registry<ActionRegistryItem>,
 
     settings_name: ConfigName,
-    settings: settings::Settings
+    settings: settings::Settings,
+
+
+    current_device_instance: Option<Box<dyn Device>>
 }
 
 
@@ -36,8 +39,8 @@ impl Orchestrator
             Some(v) => v
         };
 
-        let mut device_registry = MkRegistry::new();
-        let mut action_registry = MkRegistry::new();
+        let mut device_registry = Registry::new();
+        let mut action_registry = Registry::new();
 
         devices::register(&mut device_registry);
         actions::register(&mut action_registry);
@@ -50,12 +53,27 @@ impl Orchestrator
             action_registry,
 
             settings_name,
-            settings
+            settings,
+
+
+            current_device_instance: None
         }
     }
 
 
-    pub fn devices(&self) -> impl Iterator<Item = &MkDevice>
+    pub fn initialize(&mut self)
+    {
+        self.set_current_device(self.current_device_id());
+    }
+
+
+    pub fn finalize(&mut self)
+    {
+        self.set_current_device(None);
+    }
+
+
+    pub fn devices(&self) -> impl Iterator<Item = &DeviceRegistryItem>
     {
         self.device_registry.iter()
     }
@@ -67,22 +85,23 @@ impl Orchestrator
         Some(UniqueId::new(device_id.as_str()))
     }
 
-    pub fn current_device(&self) -> Option<&MkDevice>
+
+    pub fn current_device(&self) -> Option<&DeviceRegistryItem>
     {
         let Some(device_id) = self.current_device_id() else { return None };
         self.device_registry.by_id(device_id)
     }
 
 
-    pub fn set_current_device_id(&mut self, id: &str)
+    pub fn set_current_device_id(&mut self, id: UniqueId)
     {
-        let new_id = Some(String::from(id));
+        let new_id = Some(String::from(id.as_str()));
         if new_id == self.settings.device_id { return; }
 
         self.settings.device_id = new_id;
         self.store_settings();
 
-        // TODO unload old device, activate new
+        self.set_current_device(Some(id));
     }
 
 
@@ -93,4 +112,36 @@ impl Orchestrator
             log::error!("Error writing settings: {e}");
         }
     }
+
+
+    fn set_current_device(&mut self, id: Option<UniqueId>)
+    {
+        let prev_device_instance;
+        let new_device = match id
+        {
+            None => None,
+            Some(v) => self.device_registry.by_id(v)
+        };
+
+
+        // Replace the device instance
+        if let Some(new_device) = new_device
+        {
+            let mut new_device_instance = (new_device.factory)();
+            new_device_instance.activate();
+
+            prev_device_instance = self.current_device_instance.replace(new_device_instance);
+        }
+        else
+        {
+            prev_device_instance = self.current_device_instance.take();
+        }
+
+
+        // Deactivate the previous instance
+        if let Some(mut prev_device_instance) = prev_device_instance
+        {
+            prev_device_instance.deactivate();
+        }
+    }
 }
\ No newline at end of file
diff --git a/Linux/src/registry/mod.rs b/Linux/src/registry/mod.rs
index 5d6208a..385683d 100644
--- a/Linux/src/registry/mod.rs
+++ b/Linux/src/registry/mod.rs
@@ -16,14 +16,14 @@ pub trait RegistryItem
 
 
 
-pub struct MkRegistry<T> where T: RegistryItem
+pub struct Registry<T> where T: RegistryItem
 {
     items: HashMap<String, T>
 }
 
 
 
-impl<T> MkRegistry<T> where T: RegistryItem
+impl<T> Registry<T> where T: RegistryItem
 {
     pub fn new() -> Self
     {
@@ -35,8 +35,8 @@ impl<T> MkRegistry<T> where T: RegistryItem
 
 
     pub fn register(&mut self, device: T)
-    {    
-        let device_id = device.unique_id();        
+    {
+        let device_id = device.unique_id();
 
         log::debug!("Registered device: [{}] {}", device_id.as_str(), device.name());
         self.items.insert(String::from(device_id.as_str()), device);
diff --git a/Linux/src/util/unique_id.rs b/Linux/src/util/unique_id.rs
index dfea5ae..e0b820a 100644
--- a/Linux/src/util/unique_id.rs
+++ b/Linux/src/util/unique_id.rs
@@ -4,8 +4,10 @@ use super::validated_string::{ValidatedString, ValidatedStringPattern};
 pub type UniqueId = ValidatedString<UniqueIdPattern>;
 
 
+#[derive(PartialEq, Eq)]
 pub struct UniqueIdPattern;
 
+
 impl ValidatedStringPattern for UniqueIdPattern
 {
     fn pattern() -> &'static str { r"^[a-zA-Z0-9\.\-_]+$" }