diff --git a/src/compositor.rs b/src/compositor.rs
index 8ceeb423..4a46c67e 100644
--- a/src/compositor.rs
+++ b/src/compositor.rs
@@ -200,6 +200,7 @@ fn start_compositor2(
         default_workspace_capture: Cell::new(true),
         default_gfx_api: Cell::new(GfxApi::OpenGl),
         activation_tokens: Default::default(),
+        toplevel_lists: Default::default(),
     });
     state.tracker.register(ClientId::from_raw(0));
     create_dummy_output(&state);
diff --git a/src/globals.rs b/src/globals.rs
index 3e2a4156..93430b82 100644
--- a/src/globals.rs
+++ b/src/globals.rs
@@ -3,6 +3,7 @@ use {
         backend::Backend,
         client::Client,
         ifs::{
+            ext_foreign_toplevel_list_v1::ExtForeignToplevelListV1Global,
             ext_session_lock_manager_v1::ExtSessionLockManagerV1Global,
             ipc::{
                 wl_data_device_manager::WlDataDeviceManagerGlobal,
@@ -164,6 +165,7 @@ impl Globals {
         add_singleton!(WpCursorShapeManagerV1Global);
         add_singleton!(WpContentTypeManagerV1Global);
         add_singleton!(XdgActivationV1Global);
+        add_singleton!(ExtForeignToplevelListV1Global);
     }
 
     pub fn add_backend_singletons(&self, backend: &Rc<dyn Backend>) {
diff --git a/src/ifs.rs b/src/ifs.rs
index bfe9ad91..9c3d565f 100644
--- a/src/ifs.rs
+++ b/src/ifs.rs
@@ -1,3 +1,5 @@
+pub mod ext_foreign_toplevel_handle_v1;
+pub mod ext_foreign_toplevel_list_v1;
 pub mod ext_session_lock_manager_v1;
 pub mod ext_session_lock_v1;
 pub mod ipc;
diff --git a/src/ifs/ext_foreign_toplevel_handle_v1.rs b/src/ifs/ext_foreign_toplevel_handle_v1.rs
new file mode 100644
index 00000000..a679bcb1
--- /dev/null
+++ b/src/ifs/ext_foreign_toplevel_handle_v1.rs
@@ -0,0 +1,88 @@
+use {
+    crate::{
+        client::{Client, ClientError},
+        leaks::Tracker,
+        object::Object,
+        tree::ToplevelNode,
+        utils::buffd::{MsgParser, MsgParserError},
+        wire::{ext_foreign_toplevel_handle_v1::*, ExtForeignToplevelHandleV1Id},
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+pub struct ExtForeignToplevelHandleV1 {
+    pub id: ExtForeignToplevelHandleV1Id,
+    pub client: Rc<Client>,
+    pub tracker: Tracker<Self>,
+    pub toplevel: Rc<dyn ToplevelNode>,
+}
+
+impl ExtForeignToplevelHandleV1 {
+    fn detach(&self) {
+        self.toplevel
+            .tl_data()
+            .handles
+            .remove(&(self.client.id, self.id));
+    }
+
+    fn destroy(&self, msg: MsgParser<'_, '_>) -> Result<(), ExtSessionLockV1Error> {
+        let _req: Destroy = self.client.parse(self, msg)?;
+        self.detach();
+        self.client.remove_obj(self)?;
+        Ok(())
+    }
+
+    pub fn send_closed(&self) {
+        self.client.event(Closed { self_id: self.id });
+    }
+
+    pub fn send_done(&self) {
+        self.client.event(Done { self_id: self.id });
+    }
+
+    pub fn send_title(&self, title: &str) {
+        self.client.event(Title {
+            self_id: self.id,
+            title,
+        });
+    }
+
+    pub fn send_app_id(&self, app_id: &str) {
+        self.client.event(AppId {
+            self_id: self.id,
+            app_id,
+        });
+    }
+
+    pub fn send_identifier(&self, identifier: &str) {
+        self.client.event(Identifier {
+            self_id: self.id,
+            identifier,
+        });
+    }
+}
+
+object_base! {
+    self = ExtForeignToplevelHandleV1;
+
+    DESTROY => destroy,
+}
+
+impl Object for ExtForeignToplevelHandleV1 {
+    fn break_loops(&self) {
+        self.detach();
+    }
+}
+
+simple_add_obj!(ExtForeignToplevelHandleV1);
+
+#[derive(Debug, Error)]
+pub enum ExtSessionLockV1Error {
+    #[error("Parsing failed")]
+    MsgParserError(#[source] Box<MsgParserError>),
+    #[error(transparent)]
+    ClientError(Box<ClientError>),
+}
+efrom!(ExtSessionLockV1Error, MsgParserError);
+efrom!(ExtSessionLockV1Error, ClientError);
diff --git a/src/ifs/ext_foreign_toplevel_list_v1.rs b/src/ifs/ext_foreign_toplevel_list_v1.rs
new file mode 100644
index 00000000..09c9d26e
--- /dev/null
+++ b/src/ifs/ext_foreign_toplevel_list_v1.rs
@@ -0,0 +1,172 @@
+use {
+    crate::{
+        client::{Client, ClientError},
+        globals::{Global, GlobalName},
+        ifs::{
+            ext_foreign_toplevel_handle_v1::ExtForeignToplevelHandleV1,
+            wl_surface::{x_surface::xwindow::Xwindow, xdg_surface::xdg_toplevel::XdgToplevel},
+        },
+        leaks::Tracker,
+        object::Object,
+        tree::{NodeVisitorBase, ToplevelNode},
+        utils::buffd::{MsgParser, MsgParserError},
+        wire::{
+            ext_foreign_toplevel_list_v1::*, ExtForeignToplevelHandleV1Id,
+            ExtForeignToplevelListV1Id,
+        },
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+pub struct ExtForeignToplevelListV1Global {
+    pub name: GlobalName,
+}
+
+impl ExtForeignToplevelListV1Global {
+    pub fn new(name: GlobalName) -> Self {
+        Self { name }
+    }
+
+    fn bind_(
+        self: Rc<Self>,
+        id: ExtForeignToplevelListV1Id,
+        client: &Rc<Client>,
+        _version: u32,
+    ) -> Result<(), ExtForeignToplevelListV1Error> {
+        let obj = Rc::new(ExtForeignToplevelListV1 {
+            id,
+            client: client.clone(),
+            tracker: Default::default(),
+        });
+        track!(client, obj);
+        client.add_client_obj(&obj)?;
+        ToplevelVisitor { list: &obj }.visit_display(&client.state.root);
+        client.state.toplevel_lists.set((client.id, id), obj);
+        Ok(())
+    }
+}
+
+struct ToplevelVisitor<'a> {
+    list: &'a ExtForeignToplevelListV1,
+}
+
+impl NodeVisitorBase for ToplevelVisitor<'_> {
+    fn visit_toplevel(&mut self, node: &Rc<XdgToplevel>) {
+        node.send_to(self.list);
+    }
+
+    fn visit_xwindow(&mut self, node: &Rc<Xwindow>) {
+        node.toplevel_data.send(node.clone(), self.list);
+    }
+}
+
+pub struct ExtForeignToplevelListV1 {
+    pub id: ExtForeignToplevelListV1Id,
+    pub client: Rc<Client>,
+    pub tracker: Tracker<Self>,
+}
+
+impl ExtForeignToplevelListV1 {
+    fn detach(&self) {
+        self.client
+            .state
+            .toplevel_lists
+            .remove(&(self.client.id, self.id));
+    }
+
+    fn stop(&self, msg: MsgParser<'_, '_>) -> Result<(), ExtForeignToplevelListV1Error> {
+        let _req: Stop = self.client.parse(self, msg)?;
+        self.detach();
+        self.send_finished();
+        Ok(())
+    }
+
+    fn destroy(&self, msg: MsgParser<'_, '_>) -> Result<(), ExtForeignToplevelListV1Error> {
+        let _req: Destroy = self.client.parse(self, msg)?;
+        self.detach();
+        self.client.remove_obj(self)?;
+        Ok(())
+    }
+
+    fn send_finished(&self) {
+        self.client.event(Finished { self_id: self.id })
+    }
+
+    fn send_handle(&self, handle: &ExtForeignToplevelHandleV1) {
+        self.client.event(Toplevel {
+            self_id: self.id,
+            toplevel: handle.id,
+        });
+    }
+
+    pub fn publish_toplevel(
+        &self,
+        tl: &Rc<dyn ToplevelNode>,
+    ) -> Option<Rc<ExtForeignToplevelHandleV1>> {
+        let id: ExtForeignToplevelHandleV1Id = match self.client.new_id() {
+            Ok(i) => i,
+            Err(e) => {
+                self.client.error(e);
+                return None;
+            }
+        };
+        let handle = Rc::new(ExtForeignToplevelHandleV1 {
+            id,
+            client: self.client.clone(),
+            tracker: Default::default(),
+            toplevel: tl.clone(),
+        });
+        track!(self.client, handle);
+        self.client.add_server_obj(&handle);
+        self.send_handle(&handle);
+        Some(handle)
+    }
+}
+
+global_base!(
+    ExtForeignToplevelListV1Global,
+    ExtForeignToplevelListV1,
+    ExtForeignToplevelListV1Error
+);
+
+impl Global for ExtForeignToplevelListV1Global {
+    fn singleton(&self) -> bool {
+        true
+    }
+
+    fn version(&self) -> u32 {
+        1
+    }
+
+    fn secure(&self) -> bool {
+        true
+    }
+}
+
+simple_add_global!(ExtForeignToplevelListV1Global);
+
+object_base! {
+    self = ExtForeignToplevelListV1;
+
+    STOP => stop,
+    DESTROY => destroy,
+}
+
+impl Object for ExtForeignToplevelListV1 {
+    fn break_loops(&self) {
+        self.detach();
+    }
+}
+
+simple_add_obj!(ExtForeignToplevelListV1);
+
+#[derive(Debug, Error)]
+pub enum ExtForeignToplevelListV1Error {
+    #[error("Parsing failed")]
+    MsgParserError(#[source] Box<MsgParserError>),
+    #[error(transparent)]
+    ClientError(Box<ClientError>),
+}
+efrom!(ExtForeignToplevelListV1Error, MsgParserError);
+efrom!(ExtForeignToplevelListV1Error, ClientError);
diff --git a/src/ifs/wl_surface/x_surface/xwindow.rs b/src/ifs/wl_surface/x_surface/xwindow.rs
index b13f044b..12e45b56 100644
--- a/src/ifs/wl_surface/x_surface/xwindow.rs
+++ b/src/ifs/wl_surface/x_surface/xwindow.rs
@@ -283,7 +283,10 @@ impl Xwindow {
         }
         match map_change {
             Change::Unmap => self.tl_set_visible(false),
-            Change::Map => self.tl_set_visible(true),
+            Change::Map => {
+                self.tl_set_visible(true);
+                self.toplevel_data.broadcast(self.clone());
+            }
             Change::None => {}
         }
         self.data.state.tree_changed();
diff --git a/src/ifs/wl_surface/xdg_surface/xdg_toplevel.rs b/src/ifs/wl_surface/xdg_surface/xdg_toplevel.rs
index eee6daea..5249b715 100644
--- a/src/ifs/wl_surface/xdg_surface/xdg_toplevel.rs
+++ b/src/ifs/wl_surface/xdg_surface/xdg_toplevel.rs
@@ -6,6 +6,7 @@ use {
         cursor::KnownCursor,
         fixed::Fixed,
         ifs::{
+            ext_foreign_toplevel_list_v1::ExtForeignToplevelListV1,
             wl_seat::{NodeSeatState, SeatId, WlSeatGlobal},
             wl_surface::xdg_surface::{XdgSurface, XdgSurfaceError, XdgSurfaceExt},
         },
@@ -134,6 +135,10 @@ impl XdgToplevel {
         }
     }
 
+    pub fn send_to(self: &Rc<Self>, list: &ExtForeignToplevelListV1) {
+        self.toplevel_data.send(self.clone(), list);
+    }
+
     pub fn send_current_configure(&self) {
         let rect = self.xdg.absolute_desired_extents.get();
         self.send_configure_checked(rect.width(), rect.height());
@@ -222,13 +227,14 @@ impl XdgToplevel {
 
     fn set_title(&self, parser: MsgParser<'_, '_>) -> Result<(), XdgToplevelError> {
         let req: SetTitle = self.xdg.surface.client.parse(self, parser)?;
-        *self.toplevel_data.title.borrow_mut() = req.title.to_string();
+        self.toplevel_data.set_title(req.title);
         self.tl_title_changed();
         Ok(())
     }
 
     fn set_app_id(&self, parser: MsgParser<'_, '_>) -> Result<(), XdgToplevelError> {
         let req: SetAppId = self.xdg.surface.client.parse(self, parser)?;
+        self.toplevel_data.set_app_id(req.app_id);
         self.bugs.set(bugs::get(req.app_id));
         Ok(())
     }
@@ -585,6 +591,7 @@ impl XdgSurfaceExt for XdgToplevel {
             //     }
             // }
             self.state.tree_changed();
+            self.toplevel_data.broadcast(self.clone());
         }
     }
 
diff --git a/src/state.rs b/src/state.rs
index 49cfb508..e2c466c0 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -18,6 +18,7 @@ use {
         gfx_apis::create_gfx_context,
         globals::{Globals, GlobalsError, WaylandGlobal},
         ifs::{
+            ext_foreign_toplevel_list_v1::ExtForeignToplevelListV1,
             ext_session_lock_v1::ExtSessionLockV1,
             jay_render_ctx::JayRenderCtx,
             jay_seat_events::JaySeatEvents,
@@ -50,7 +51,8 @@ use {
         video::drm::Drm,
         wheel::Wheel,
         wire::{
-            JayRenderCtxId, JaySeatEventsId, JayWorkspaceWatcherId, ZwpLinuxDmabufFeedbackV1Id,
+            ExtForeignToplevelListV1Id, JayRenderCtxId, JaySeatEventsId, JayWorkspaceWatcherId,
+            ZwpLinuxDmabufFeedbackV1Id,
         },
         xkbcommon::{XkbContext, XkbKeymap},
         xwayland::{self, XWaylandEvent},
@@ -136,6 +138,8 @@ pub struct State {
     pub default_workspace_capture: Cell<bool>,
     pub default_gfx_api: Cell<GfxApi>,
     pub activation_tokens: CopyHashMap<ActivationToken, ()>,
+    pub toplevel_lists:
+        CopyHashMap<(ClientId, ExtForeignToplevelListV1Id), Rc<ExtForeignToplevelListV1>>,
 }
 
 // impl Drop for State {
@@ -670,6 +674,7 @@ impl State {
         self.pending_float_titles.clear();
         self.render_ctx_watchers.clear();
         self.workspace_watchers.clear();
+        self.toplevel_lists.clear();
         self.slow_clients.clear();
         for (_, h) in self.input_device_handlers.borrow_mut().drain() {
             h.async_event.clear();
diff --git a/src/tree/placeholder.rs b/src/tree/placeholder.rs
index c5bdcceb..d7a7516f 100644
--- a/src/tree/placeholder.rs
+++ b/src/tree/placeholder.rs
@@ -33,7 +33,7 @@ impl PlaceholderNode {
             id: state.node_ids.next(),
             toplevel: ToplevelData::new(
                 state,
-                node.tl_data().title.borrow_mut().clone(),
+                node.tl_data().title.borrow().clone(),
                 node.node_client(),
             ),
             destroyed: Default::default(),
diff --git a/src/tree/toplevel.rs b/src/tree/toplevel.rs
index 44c0fddc..f0e36fb4 100644
--- a/src/tree/toplevel.rs
+++ b/src/tree/toplevel.rs
@@ -1,11 +1,22 @@
 use {
     crate::{
-        client::Client,
-        ifs::wl_seat::{collect_kb_foci, collect_kb_foci2, NodeSeatState, SeatId},
+        client::{Client, ClientId},
+        ifs::{
+            ext_foreign_toplevel_handle_v1::ExtForeignToplevelHandleV1,
+            ext_foreign_toplevel_list_v1::ExtForeignToplevelListV1,
+            wl_seat::{collect_kb_foci, collect_kb_foci2, NodeSeatState, SeatId},
+        },
         rect::Rect,
         state::State,
         tree::{ContainingNode, Direction, Node, OutputNode, PlaceholderNode, WorkspaceNode},
-        utils::{clonecell::CloneCell, smallmap::SmallMap, threshold_counter::ThresholdCounter},
+        utils::{
+            clonecell::CloneCell,
+            copyhashmap::CopyHashMap,
+            smallmap::SmallMap,
+            threshold_counter::ThresholdCounter,
+            toplevel_identifier::{toplevel_identifier, ToplevelIdentifier},
+        },
+        wire::ExtForeignToplevelHandleV1Id,
     },
     std::{
         cell::{Cell, RefCell},
@@ -176,6 +187,10 @@ pub struct ToplevelData {
     pub seat_state: NodeSeatState,
     pub wants_attention: Cell<bool>,
     pub requested_attention: Cell<bool>,
+    pub app_id: RefCell<String>,
+    pub identifier: Cell<ToplevelIdentifier>,
+    pub handles:
+        CopyHashMap<(ClientId, ExtForeignToplevelHandleV1Id), Rc<ExtForeignToplevelHandleV1>>,
 }
 
 impl ToplevelData {
@@ -199,6 +214,9 @@ impl ToplevelData {
             seat_state: Default::default(),
             wants_attention: Cell::new(false),
             requested_attention: Cell::new(false),
+            app_id: Default::default(),
+            identifier: Cell::new(toplevel_identifier()),
+            handles: Default::default(),
         }
     }
 
@@ -216,6 +234,13 @@ impl ToplevelData {
     }
 
     pub fn destroy_node(&self, node: &dyn Node) {
+        self.identifier.set(toplevel_identifier());
+        {
+            let mut handles = self.handles.lock();
+            for (_, handle) in handles.drain() {
+                handle.send_closed();
+            }
+        }
         if let Some(fd) = self.fullscrceen_data.borrow_mut().take() {
             fd.placeholder.tl_destroy();
         }
@@ -227,6 +252,58 @@ impl ToplevelData {
         self.focus_node.clear();
     }
 
+    pub fn broadcast(&self, toplevel: Rc<dyn ToplevelNode>) {
+        let id = self.identifier.get().to_string();
+        let title = self.title.borrow();
+        let app_id = self.app_id.borrow();
+        for list in self.state.toplevel_lists.lock().values() {
+            self.send_once(&toplevel, list, &id, &title, &app_id);
+        }
+    }
+
+    pub fn send(&self, toplevel: Rc<dyn ToplevelNode>, list: &ExtForeignToplevelListV1) {
+        let id = self.identifier.get().to_string();
+        let title = self.title.borrow();
+        let app_id = self.app_id.borrow();
+        self.send_once(&toplevel, list, &id, &title, &app_id);
+    }
+
+    fn send_once(
+        &self,
+        toplevel: &Rc<dyn ToplevelNode>,
+        list: &ExtForeignToplevelListV1,
+        id: &str,
+        title: &str,
+        app_id: &str,
+    ) {
+        let handle = match list.publish_toplevel(toplevel) {
+            None => return,
+            Some(handle) => handle,
+        };
+        handle.send_identifier(id);
+        handle.send_title(title);
+        handle.send_app_id(app_id);
+        handle.send_done();
+        self.handles
+            .set((handle.client.id, handle.id), handle.clone());
+    }
+
+    pub fn set_title(&self, title: &str) {
+        *self.title.borrow_mut() = title.to_string();
+        for handle in self.handles.lock().values() {
+            handle.send_title(title);
+            handle.send_done();
+        }
+    }
+
+    pub fn set_app_id(&self, app_id: &str) {
+        *self.app_id.borrow_mut() = app_id.to_string();
+        for handle in self.handles.lock().values() {
+            handle.send_app_id(app_id);
+            handle.send_done();
+        }
+    }
+
     pub fn set_fullscreen(
         &self,
         state: &Rc<State>,
diff --git a/src/utils.rs b/src/utils.rs
index 6f5435fa..aacfb54a 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -34,6 +34,7 @@ pub mod stack;
 pub mod syncqueue;
 pub mod threshold_counter;
 pub mod timer;
+pub mod toplevel_identifier;
 pub mod tri;
 pub mod trim;
 pub mod unlink_on_drop;
diff --git a/src/utils/toplevel_identifier.rs b/src/utils/toplevel_identifier.rs
new file mode 100644
index 00000000..6e6a5b43
--- /dev/null
+++ b/src/utils/toplevel_identifier.rs
@@ -0,0 +1,28 @@
+use {
+    crate::utils::opaque::{opaque, Opaque, OpaqueError},
+    std::{
+        fmt::{Display, Formatter},
+        str::FromStr,
+    },
+};
+
+#[derive(Debug, Eq, PartialEq, Copy, Clone, Hash)]
+pub struct ToplevelIdentifier(Opaque);
+
+pub fn toplevel_identifier() -> ToplevelIdentifier {
+    ToplevelIdentifier(opaque())
+}
+
+impl Display for ToplevelIdentifier {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl FromStr for ToplevelIdentifier {
+    type Err = OpaqueError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(Self(s.parse()?))
+    }
+}
diff --git a/src/xwayland/xwm.rs b/src/xwayland/xwm.rs
index 84539399..39052f8c 100644
--- a/src/xwayland/xwm.rs
+++ b/src/xwayland/xwm.rs
@@ -1102,7 +1102,7 @@ impl Wm {
         }
         let title = buf.as_bstr().to_string();
         if let Some(window) = data.window.get() {
-            *window.toplevel_data.title.borrow_mut() = title.clone();
+            window.toplevel_data.set_title(&title);
             window.tl_title_changed();
         }
         *data.info.title.borrow_mut() = Some(title);
diff --git a/wire/ext_foreign_toplevel_handle_v1.txt b/wire/ext_foreign_toplevel_handle_v1.txt
new file mode 100644
index 00000000..423b2de9
--- /dev/null
+++ b/wire/ext_foreign_toplevel_handle_v1.txt
@@ -0,0 +1,24 @@
+# requests
+
+msg destroy = 0 {
+}
+
+# events
+
+msg closed = 0 {
+}
+
+msg done = 1 {
+}
+
+msg title = 2 {
+    title: str,
+}
+
+msg app_id = 3 {
+    app_id: str,
+}
+
+msg identifier = 4 {
+    identifier: str,
+}
diff --git a/wire/ext_foreign_toplevel_list_v1.txt b/wire/ext_foreign_toplevel_list_v1.txt
new file mode 100644
index 00000000..45b260b0
--- /dev/null
+++ b/wire/ext_foreign_toplevel_list_v1.txt
@@ -0,0 +1,16 @@
+# requests
+
+msg stop = 0 {
+}
+
+msg destroy = 1 {
+}
+
+# events
+
+msg toplevel = 0 {
+    toplevel: id(ext_foreign_toplevel_handle_v1),
+}
+
+msg finished = 1 {
+}