diff --git a/static/js/nav.js b/static/js/nav.js
index 12b55ff..a972b0f 100644
--- a/static/js/nav.js
+++ b/static/js/nav.js
@@ -12,6 +12,8 @@
   'use strict';
   const html = document.documentElement;
   const authed = typeof IS_AUTHENTICATED === 'undefined' || !!IS_AUTHENTICATED;
+  // A project's own window (desktop, docs/projects.md): it remembers nothing for the others.
+  const soloWindow = /[?&]project=\d+/.test(location.search);
 
   const SECTIONS = [
     {id: 'home', group: 'home', label: 'Home', icon: '⌂', panel: 'home', account: true},
@@ -146,8 +148,10 @@
   function setCurrent(id) {
     current = id;
     const s = byId[id];
-    if (!s.transient) save('diora_nav_section', id);   // the app opens where one was, not in the search
-    if (!s.footer) save('diora_nav_last_' + s.group, id);
+    if (!soloWindow) {
+      if (!s.transient) save('diora_nav_section', id);   // the app opens where one was, not in the search
+      if (!s.footer) save('diora_nav_last_' + s.group, id);
+    }
     syncHash();
     render();
     listeners.slice().forEach(fn => { try { fn(id); } catch (e) {} });
diff --git a/static/js/projects.js b/static/js/projects.js
index 4eba74b..5ff9405 100644
--- a/static/js/projects.js
+++ b/static/js/projects.js
@@ -843,18 +843,29 @@
   }
 
   function openSource(i) {
-    if (i.kind === 'book') {
-      if (typeof openBook === 'function') openBook(i.ref);
-    } else if (i.kind === 'episode') {
-      const row = {id: i.ref, feed__id: i.data.feed, title: cslTitle(i.data.csl), feed__title: i.data.podcast};
+    const c = (i.data && i.data.csl) || {};
+    const what = {kind: i.kind, ref: i.ref, feed: i.data ? i.data.feed : 0, title: cslTitle(c),
+      podcast: i.data ? i.data.podcast : '', url: c.DOI ? 'https://doi.org/' + c.DOI : (c.URL || '')};
+    // A project's own window (desktop): the main window opens it, with its reader and player.
+    if (solo && what.kind !== 'paper' && window.dioraDesktop && window.dioraDesktop.openInMain) {
+      window.dioraDesktop.openInMain(what);
+      return;
+    }
+    openThing(what);
+  }
+
+  // {kind, ref, feed, url}: a book, an episode, an article where it lives; a paper by its link.
+  function openThing(w) {
+    if (w.kind === 'book') {
+      if (typeof openBook === 'function') openBook(w.ref);
+    } else if (w.kind === 'episode') {
+      const row = {id: w.ref, feed__id: w.feed, title: w.title || '', feed__title: w.podcast || ''};
       if (window.__dioraPodcastOpenEpisode && window.__dioraPodcastOpenEpisode(row)) return;
-      if (i.data.feed && window.__dioraPodcastOpenFeed) window.__dioraPodcastOpenFeed(i.data.feed);
-    } else if (i.kind === 'article') {
-      if (window.__dioraFeedsOpenItem) window.__dioraFeedsOpenItem(i.ref);
-    } else {
-      const c = i.data.csl || {};
-      const url = c.DOI ? 'https://doi.org/' + c.DOI : c.URL;
-      if (url) window.open(url, '_blank', 'noopener');
+      if (w.feed && window.__dioraPodcastOpenFeed) window.__dioraPodcastOpenFeed(w.feed);
+    } else if (w.kind === 'article') {
+      if (window.__dioraFeedsOpenItem) window.__dioraFeedsOpenItem(w.ref);
+    } else if (w.url) {
+      window.open(w.url, '_blank', 'noopener');
     }
   }
 
@@ -1041,6 +1052,13 @@
     };
   }
   window.addEventListener('beforeunload', () => { if (saveState === 'nicht gespeichert') saveNote(); });
+  // Back at this window (another one, another device may have changed the project): fresh,
+  // unless a note is being written here.
+  window.addEventListener('focus', () => {
+    if (tab.style.display === 'none' || st.note != null || st.creating) return;
+    if (st.open) openProject(st.open.id, true).catch(() => {});
+    else loadList().then(render);
+  });
   if (solo) {
     document.title = 'Projekt · diora';
     if (typeof showTab === 'function') showTab('projekte');
@@ -1060,6 +1078,7 @@
       openProject(Number(id)).catch(() => {});
     },
     onChange(fn) { if (typeof fn === 'function') linkListeners.push(fn); },
+    openSource: openThing,
     load: loadList,
   };
   // The links for the sheets ("in Projekt …"), once the page has settled.
@@ -1152,7 +1171,8 @@
     '#prj-toast { position: fixed; left: 50%; bottom: calc(var(--nui-dock-h, 0px) + 90px); transform: translateX(-50%); z-index: 3100; background: var(--raised, #222); color: var(--fg, #eee); padding: 10px 16px; border-radius: 8px; font-size: 14px; opacity: 0; pointer-events: none; transition: opacity .2s; max-width: calc(100vw - 32px); }',
     '#prj-toast.prj-show { opacity: 1; }',
     // A window of its own (desktop): only the project.
-    'html.prj-solo #tabs, html.prj-solo #nav-segments, html.prj-solo header, html.prj-solo .site-header, html.prj-solo #nui-dock, html.prj-solo .nui-section-bar { display: none !important; }',
+    'html.prj-solo #tabs, html.prj-solo #nav-segments, html.prj-solo header, html.prj-solo .site-header, html.prj-solo #nui-dock, html.prj-solo #tab-projekte .nui-section-bar { display: none !important; }',
+    'html.prj-solo body { padding-left: 0 !important; padding-bottom: 0 !important; }',
     'html.prj-solo #tab-projekte { padding-top: 12px; }',
     'body.eink #tab-projekte .prj-primary, body.eink #tab-projekte .prj-chip.on { background: #000; color: #fff; }',
   ].join('\n');