diff --git a/backend/src/main.rs b/backend/src/main.rs
index 7043f81..fe6bfd7 100644
--- a/backend/src/main.rs
+++ b/backend/src/main.rs
@@ -1,15 +1,14 @@
 use moon::*;
 
 async fn frontend() -> Frontend {
-    Frontend::new().title("FastWave").append_to_head(concat!(
-        "<style>",
-        include_str!("../style.css"),
-        "</style>"
-    )).append_to_head(concat!(
-        "<script type=\"module\">",
-        include_str!("../index.js"),
-        "</script>"
-    ))
+    Frontend::new()
+        .title("FastWave")
+        .append_to_head(concat!("<style>", include_str!("../style.css"), "</style>"))
+        .append_to_head(concat!(
+            "<script type=\"module\">",
+            include_str!("../index.js"),
+            "</script>"
+        ))
 }
 
 async fn up_msg_handler(_: UpMsgRequest<()>) {}
diff --git a/frontend/src/controls_panel.rs b/frontend/src/controls_panel.rs
index 69fff23..ad3e215 100644
--- a/frontend/src/controls_panel.rs
+++ b/frontend/src/controls_panel.rs
@@ -1,4 +1,4 @@
-use crate::{platform, Layout};
+use crate::{platform, script_bridge, Layout};
 use std::cell::Cell;
 use std::mem;
 use std::ops::Not;
@@ -108,6 +108,7 @@ impl ControlsPanel {
                     .item(self.load_button())
                     .item(self.layout_switcher()),
             )
+            .item(self.command_panel())
             .item_signal(
                 self.hierarchy
                     .signal_cloned()
@@ -256,6 +257,65 @@ impl ControlsPanel {
             })
     }
 
+    fn command_panel(&self) -> impl Element {
+        let command_result: Mutable<Option<Result<JsValue, JsValue>>> = <_>::default();
+        Row::new()
+            .item(self.command_editor_panel(command_result.clone()))
+            .item(self.command_result_panel(command_result.read_only()))
+    }
+
+    fn command_editor_panel(
+        &self,
+        command_result: Mutable<Option<Result<JsValue, JsValue>>>,
+    ) -> impl Element {
+        let (script, script_signal) = Mutable::new_and_signal_cloned(String::new());
+        TextArea::new()
+            .placeholder(Placeholder::new("FW.say_hello()"))
+            .label_hidden("command editor panel")
+            .text_signal(script_signal)
+            .on_change(clone!((script, command_result) move |text| {
+                script.set_neq(text);
+                command_result.set_neq(None);
+            }))
+            .on_key_down_event_with_options(EventOptions::new().preventable(), move |event| {
+                if event.key() == &Key::Enter {
+                    let RawKeyboardEvent::KeyDown(raw_event) = event.raw_event.clone();
+                    if raw_event.shift_key() {
+                        // @TODO move `prevent_default` to MZ API (next to the `pass_to_parent` method?)
+                        raw_event.prevent_default();
+                        let result = script_bridge::strict_eval(&script.lock_ref());
+                        command_result.set(Some(result));
+                    }
+                }
+            })
+    }
+
+    fn command_result_panel(
+        &self,
+        command_result: ReadOnlyMutable<Option<Result<JsValue, JsValue>>>,
+    ) -> impl Element {
+        El::new().child_signal(
+            command_result
+                .signal_cloned()
+                .map_some(|result| match result {
+                    Ok(js_value) => {
+                        if let Some(string_value) = js_value.as_string() {
+                            string_value
+                        } else if let Some(number_value) = js_value.as_f64() {
+                            number_value.to_string()
+                        } else if let Some(bool_value) = js_value.as_bool() {
+                            bool_value.to_string()
+                        } else {
+                            format!("{js_value:?}")
+                        }
+                    }
+                    Err(js_value) => {
+                        format!("Error: {js_value:?}")
+                    }
+                }),
+        )
+    }
+
     fn scopes_panel(&self, hierarchy: Rc<wellen::Hierarchy>) -> impl Element {
         Column::new()
             .s(Height::fill().min(150))
diff --git a/frontend/src/main.rs b/frontend/src/main.rs
index 847d045..ef7859d 100644
--- a/frontend/src/main.rs
+++ b/frontend/src/main.rs
@@ -17,6 +17,13 @@ enum Layout {
     Columns,
 }
 
+#[derive(Default)]
+struct Store {
+    selected_var_refs: MutableVec<wellen::VarRef>,
+}
+
+static STORE: Lazy<Store> = lazy::default();
+
 fn main() {
     start_app("app", root);
     Task::start(async {
@@ -28,7 +35,7 @@ fn main() {
 
 fn root() -> impl Element {
     let hierarchy: Mutable<Option<Rc<wellen::Hierarchy>>> = <_>::default();
-    let selected_var_refs: MutableVec<wellen::VarRef> = <_>::default();
+    let selected_var_refs = STORE.selected_var_refs.clone();
     let layout: Mutable<Layout> = <_>::default();
     Column::new()
         .s(Height::fill())
diff --git a/frontend/src/platform/browser.rs b/frontend/src/platform/browser.rs
index 09f94fb..8fcb001 100644
--- a/frontend/src/platform/browser.rs
+++ b/frontend/src/platform/browser.rs
@@ -4,11 +4,11 @@ use wellen::simple::Waveform;
 use zoon::*;
 
 #[derive(Default)]
-struct Store {
+struct BrowserPlatformStore {
     waveform: Mutex<Option<Waveform>>,
 }
 
-static STORE: Lazy<Store> = lazy::default();
+static BROWSER_PLATFORM_STORE: Lazy<BrowserPlatformStore> = lazy::default();
 
 pub(super) async fn show_window() {}
 
@@ -25,7 +25,7 @@ pub(super) async fn pick_and_load_waveform(
     let Ok(waveform) = waveform else {
         panic!("Waveform file reading failed")
     };
-    *STORE.waveform.lock().unwrap_throw() = Some(waveform);
+    *BROWSER_PLATFORM_STORE.waveform.lock().unwrap_throw() = Some(waveform);
     Some(file.name())
 }
 
@@ -63,12 +63,12 @@ pub(super) async fn pick_and_load_waveform(
 //     let Ok(waveform) = waveform else {
 //         panic!("Waveform file reading failed")
 //     };
-//     *STORE.waveform.lock().unwrap_throw() = Some(waveform);
+//     *BROWSER_PLATFORM_STORE.waveform.lock().unwrap_throw() = Some(waveform);
 //     Some(file.name())
 // }
 
 pub(super) async fn get_hierarchy() -> wellen::Hierarchy {
-    let waveform = STORE.waveform.lock().unwrap_throw();
+    let waveform = BROWSER_PLATFORM_STORE.waveform.lock().unwrap_throw();
     let hierarchy = waveform.as_ref().unwrap_throw().hierarchy();
     // @TODO Wrap `hierarchy` in `Waveform` with `Rc/Arc` or add the method `take` / `clone` or refactor?
     serde_json::from_value(serde_json::to_value(hierarchy).unwrap_throw()).unwrap_throw()
@@ -82,7 +82,7 @@ pub(super) async fn load_signal_and_get_timeline(
     block_height: u32,
     var_format: shared::VarFormat,
 ) -> shared::Timeline {
-    let mut waveform_lock = STORE.waveform.lock().unwrap();
+    let mut waveform_lock = BROWSER_PLATFORM_STORE.waveform.lock().unwrap();
     let waveform = waveform_lock.as_mut().unwrap();
     waveform.load_signals_multi_threaded(&[signal_ref]);
     let signal = waveform.get_signal(signal_ref).unwrap();
@@ -100,7 +100,7 @@ pub(super) async fn load_signal_and_get_timeline(
 }
 
 pub(super) async fn unload_signal(signal_ref: wellen::SignalRef) {
-    let mut waveform_lock = STORE.waveform.lock().unwrap_throw();
+    let mut waveform_lock = BROWSER_PLATFORM_STORE.waveform.lock().unwrap_throw();
     let waveform = waveform_lock.as_mut().unwrap_throw();
     waveform.unload_signals(&[signal_ref]);
 }
diff --git a/frontend/src/script_bridge.rs b/frontend/src/script_bridge.rs
index 027524e..31d66bc 100644
--- a/frontend/src/script_bridge.rs
+++ b/frontend/src/script_bridge.rs
@@ -1,6 +1,9 @@
-use zoon::{*, println};
+use crate::STORE;
+use zoon::*;
 
-#[wasm_bindgen(inline_js = r#"export function strict_eval(code) { return eval?.(`"use strict"; ${code};`) }"#)]
+#[wasm_bindgen(
+    inline_js = r#"export function strict_eval(code) { "use strict"; return eval?.(`${code}`) }"#
+)]
 extern "C" {
     #[wasm_bindgen(catch)]
     pub fn strict_eval(code: &str) -> Result<JsValue, JsValue>;
@@ -11,11 +14,14 @@ pub struct FW;
 
 #[wasm_bindgen]
 impl FW {
-    pub fn do_something() {
-        println!("Command result: {:#?}", strict_eval("FW.do_something_else();"));
+    pub fn say_hello() -> String {
+        "Hello!".to_owned()
     }
 
-    pub fn do_something_else() {
-        println!("ELSE!");
+    pub fn clear_variables() -> String {
+        let mut vars = STORE.selected_var_refs.lock_mut();
+        let var_count = vars.len();
+        vars.clear();
+        format!("{var_count} variables cleared")
     }
 }
diff --git a/frontend/src/waveform_panel.rs b/frontend/src/waveform_panel.rs
index db09a44..2493ea9 100644
--- a/frontend/src/waveform_panel.rs
+++ b/frontend/src/waveform_panel.rs
@@ -130,9 +130,8 @@ impl WaveformPanel {
         )
         .await;
 
-        let timescale = hierarchy.timescale();
-        // @TODO remove
-        zoon::println!("{timescale:?}");
+        // @TODO render timeline with time units
+        // let timescale = hierarchy.timescale();
 
         // Note: Sync `timeline`'s type with the `Timeline` in `frontend/typescript/pixi_canvas/pixi_canvas.ts'
         let timeline = serde_wasm_bindgen::to_value(&timeline).unwrap_throw();