diff --git a/server/2015Remote/WebPage.h b/server/2015Remote/WebPage.h
index c655be3..ded4f56 100644
--- a/server/2015Remote/WebPage.h
+++ b/server/2015Remote/WebPage.h
@@ -336,6 +336,9 @@ inline std::string GetWebPageHTML() {
             white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
             max-width: 100%; opacity: 0.8;
         }
+        .device-card .active-window.busy {
+            color: #e94560; opacity: 1; font-weight: 500;
+        }
         .device-card .meta-row { display: flex; gap: 12px; margin-top: 6px; font-size: 12px; color: #666; }
         .device-card .meta-item { display: flex; align-items: center; gap: 4px; }
         .device-card .meta-item.rtt { font-weight: 500; }
@@ -854,6 +857,7 @@ inline std::string GetWebPageHTML() {
                 <button class="shortcut-btn" data-key="190" tabindex="-1">.</button>
                 <button class="shortcut-btn" data-key="188" tabindex="-1">,</button>
                 <button class="shortcut-btn" data-key="191" data-shift="1" tabindex="-1">?</button>
+                <button class="shortcut-btn" data-key="32" data-ctrl="1" tabindex="-1" title="Ctrl+Space">&#x4E2D;</button>
             </div>
         </div>
         <div class="touch-indicator" id="touch-indicator"></div>
@@ -1221,6 +1225,13 @@ inline std::string GetWebPageHTML() {
             return 'rtt-poor';                     // Red: > 300ms
         }
 
+        function isWindowBusy(activeWindow) {
+            if (!activeWindow || activeWindow.trim() === '') return false;
+            const lower = activeWindow.toLowerCase();
+            if (lower.includes('locked') || lower.includes('inactive')) return false;
+            return true;
+        }
+
         function updateDeviceInfo(deviceId, rtt, activeWindow) {
             // Update device in array
             const device = devices.find(d => d.id === deviceId || d.id === String(deviceId));
@@ -1258,6 +1269,7 @@ inline std::string GetWebPageHTML() {
                         }
                         winEl.textContent = activeWindow;
                         winEl.title = activeWindow;
+                        winEl.className = 'active-window' + (isWindowBusy(activeWindow) ? ' busy' : '');
                     } else if (winEl) {
                         winEl.remove();
                     }
@@ -1303,7 +1315,7 @@ inline std::string GetWebPageHTML() {
                             '<span class="meta-item">Ver: ' + escapeHtml(ver) + '</span>' +
                             '<span class="meta-item">' + screenInfo + '</span>' +
                         '</div>' +
-                        (activeWin ? '<div class="active-window" title="' + escapeHtml(activeWin) + '">' + escapeHtml(activeWin) + '</div>' : '') +
+                        (activeWin ? '<div class="active-window' + (isWindowBusy(activeWin) ? ' busy' : '') + '" title="' + escapeHtml(activeWin) + '">' + escapeHtml(activeWin) + '</div>' : '') +
                     '</div>';
                 }).join('');
             }
@@ -2584,10 +2596,13 @@ inline std::string GetWebPageHTML() {
                         e.preventDefault();
                         const keyCode = parseInt(btn.dataset.key);
                         const needShift = btn.dataset.shift === '1';
+                        const needCtrl = btn.dataset.ctrl === '1';
+                        if (needCtrl) sendShortcutKey(17, true);   // Ctrl down
                         if (needShift) sendShortcutKey(16, true);  // Shift down
                         sendShortcutKey(keyCode, true);
                         sendShortcutKey(keyCode, false);
                         if (needShift) sendShortcutKey(16, false);  // Shift up
+                        if (needCtrl) sendShortcutKey(17, false);   // Ctrl up
                     });
                     btn.addEventListener('click', function(e) {
                         e.preventDefault();
@@ -2595,10 +2610,13 @@ inline std::string GetWebPageHTML() {
                         if (!('ontouchstart' in window)) {
                             const keyCode = parseInt(btn.dataset.key);
                             const needShift = btn.dataset.shift === '1';
+                            const needCtrl = btn.dataset.ctrl === '1';
+                            if (needCtrl) sendShortcutKey(17, true);   // Ctrl down
                             if (needShift) sendShortcutKey(16, true);
                             sendShortcutKey(keyCode, true);
                             sendShortcutKey(keyCode, false);
                             if (needShift) sendShortcutKey(16, false);
+                            if (needCtrl) sendShortcutKey(17, false);   // Ctrl up
                         }
                     });
                 });