diff --git a/FrOSCon26/FrOSCon.26.mm b/FrOSCon26/FrOSCon.26.mm
index 4835758..41570ef 100644
--- a/FrOSCon26/FrOSCon.26.mm
+++ b/FrOSCon26/FrOSCon.26.mm
@@ -336,8 +336,7 @@
       allein der Umstand daß Cores direkt an einem Cache hängen, genügt, um die Notwendigkeit der Synchronisation aufzuzeigen ... daher ist das Schlüsselwort auch "cache-coherence"
     </p>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 <node CREATED="1786245489365" ID="ID_763564504" MODIFIED="1786245499980" TEXT="Englisch: coherence, nicht coherency">
 <icon BUILTIN="messagebox_warning"/>
 </node>
@@ -759,8 +758,7 @@
       <font face="Monospaced" size="2" color="#261b52">&#160;&#160;&#160;&#160;// walk away &#8212; no information gained, positive or negative </font>
     </p>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 </node>
 </node>
 </node>
@@ -1067,8 +1065,7 @@
       Thread polls &#187;readiness&#171; &#10233; <b>Reactor</b>
     </p>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 </node>
 <node CREATED="1785875601816" ID="ID_1044114554" MODIFIED="1786296163481">
 <richcontent TYPE="NODE"><html>
@@ -1114,8 +1111,9 @@
 <node CREATED="1786298283402" ID="ID_1682945175" MODIFIED="1786298292387" TEXT="show implementation of PixelFeed"/>
 <node CREATED="1786298394770" ID="ID_1136560741" MODIFIED="1786298397453" TEXT="show methods"/>
 <node CREATED="1786298398153" ID="ID_519557401" MODIFIED="1786298416627" TEXT="Thread binds &#x27f6; playVideo()"/>
-<node CREATED="1786299984706" ID="ID_203769685" MODIFIED="1786300115286" TEXT="Diagram: thread-handoff">
-<arrowlink COLOR="#2d545f" DESTINATION="ID_1123988986" ENDARROW="Default" ENDINCLINATION="-1879;-116;" ID="Arrow_ID_395148395" STARTARROW="None" STARTINCLINATION="-1209;140;"/>
+<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1786299984706" ID="ID_203769685" MODIFIED="1786456125776" TEXT="Diagram: thread-handoff">
+<arrowlink COLOR="#2d545f" DESTINATION="ID_1123988986" ENDARROW="Default" ENDINCLINATION="-1879;-116;" ID="Arrow_ID_395148395" STARTARROW="None" STARTINCLINATION="-1226;128;"/>
+<icon BUILTIN="flag-pink"/>
 </node>
 </node>
 </node>
@@ -1151,7 +1149,7 @@
 <node CREATED="1786299359790" ID="ID_1128649186" MODIFIED="1786299370033" TEXT="confirm CQE as handled"/>
 </node>
 <node CREATED="1786299397501" ID="ID_981472972" MODIFIED="1786299419821" TEXT="Proactor: completed read">
-<node CREATED="1786299493124" ID="ID_1394193649" MODIFIED="1786299510358" TEXT="pick state slot for frame-nr"/>
+<node CREATED="1786299493124" ID="ID_1394193649" MODIFIED="1786457445555" TEXT="pick state slot for frame-num"/>
 <node CREATED="1786299531301" ID="ID_1067904542" MODIFIED="1786299535994" TEXT="detect incomplete read"/>
 <node CREATED="1786299537788" ID="ID_630083033" MODIFIED="1786299543322" TEXT="advance state-engine">
 <node CREATED="1786298759408" ID="ID_1255181239" MODIFIED="1786298765827" TEXT="state definition"/>
@@ -1168,8 +1166,20 @@
 <node CREATED="1786329188409" ID="ID_1322310081" MODIFIED="1786329219244" TEXT="advanced only when display complete"/>
 <node CREATED="1786329228286" ID="ID_1649533931" MODIFIED="1786329233043" TEXT="used to access state"/>
 </node>
+<node CREATED="1786458013162" ID="ID_835285601" MODIFIED="1786458019665" TEXT="cross-thread hand-off">
+<node CREATED="1786458038925" MODIFIED="1786458038925" TEXT="read barrier"/>
+<node CREATED="1786458038925" MODIFIED="1786458038925" TEXT="write barrier"/>
+</node>
+<node CREATED="1786458201693" ID="ID_303803696" MODIFIED="1786458204937" TEXT="Backpressure"/>
+</node>
+<node CREATED="1786329296620" ID="ID_945769615" MODIFIED="1786329301176" TEXT="EGL: display frame">
+<node CREATED="1786458316212" ID="ID_1092541925" MODIFIED="1786458499072" TEXT="tolerate Backpressure"/>
+<node CREATED="1786458332764" ID="ID_1698018544" MODIFIED="1786458348416" TEXT="use callback interface"/>
+<node CREATED="1786458353163" ID="ID_1174511438" MODIFIED="1786458621462" TEXT="cross-thread synchronisation">
+<node CREATED="1786458563096" ID="ID_1610867648" MODIFIED="1786458568812" TEXT="acquire frame: read barrier"/>
+<node CREATED="1786458569364" ID="ID_819239168" MODIFIED="1786458577996" TEXT="signal complete: write barrier"/>
+</node>
 </node>
-<node CREATED="1786329296620" ID="ID_945769615" MODIFIED="1786329301176" TEXT="EGL: display frame"/>
 </node>
 <node BACKGROUND_COLOR="#e1cdb4" CREATED="1786273770202" ID="ID_528855258" MODIFIED="1786273966234" STYLE="bubble" TEXT="40">
 <edge COLOR="#c00636"/>
@@ -1295,15 +1305,18 @@
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1785880050158" ID="ID_1123988986" MODIFIED="1786300115287" TEXT="Diagramm &quot;Thread-handoff&quot;">
-<linktarget COLOR="#339dbd" DESTINATION="ID_1123988986" ENDARROW="Default" ENDINCLINATION="121;0;" ID="Arrow_ID_1210919925" SOURCE="ID_1725774104" STARTARROW="None" STARTINCLINATION="-30;41;"/>
-<linktarget COLOR="#2d545f" DESTINATION="ID_1123988986" ENDARROW="Default" ENDINCLINATION="-1879;-116;" ID="Arrow_ID_395148395" SOURCE="ID_203769685" STARTARROW="None" STARTINCLINATION="-1209;140;"/>
-<icon BUILTIN="flag-yellow"/>
-</node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1785880050158" ID="ID_1806019726" MODIFIED="1785880116038" TEXT="Diagramm &quot;State-Engine&quot;">
 <linktarget COLOR="#339dbd" DESTINATION="ID_1806019726" ENDARROW="Default" ENDINCLINATION="121;0;" ID="Arrow_ID_938057656" SOURCE="ID_1725774104" STARTARROW="None" STARTINCLINATION="-30;41;"/>
 <icon BUILTIN="flag-yellow"/>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1785880050158" ID="ID_1123988986" MODIFIED="1786456139155" TEXT="Diagramm &quot;Thread-handoff&quot;">
+<linktarget COLOR="#2d545f" DESTINATION="ID_1123988986" ENDARROW="Default" ENDINCLINATION="-1879;-116;" ID="Arrow_ID_395148395" SOURCE="ID_203769685" STARTARROW="None" STARTINCLINATION="-1226;128;"/>
+<linktarget COLOR="#339dbd" DESTINATION="ID_1123988986" ENDARROW="Default" ENDINCLINATION="121;0;" ID="Arrow_ID_1210919925" SOURCE="ID_1725774104" STARTARROW="None" STARTINCLINATION="-30;41;"/>
+<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1786456142877" HGAP="42" ID="ID_724342124" MODIFIED="1786456162177" TEXT="visuell klarer machen" VSHIFT="19">
+<icon BUILTIN="yes"/>
+</node>
+</node>
 <node COLOR="#338800" CREATED="1785877094220" ID="ID_404598432" MODIFIED="1786417301454" TEXT="Diagramm &quot;Application setup&quot;">
 <icon BUILTIN="button_ok"/>
 <node CREATED="1786417174016" ID="ID_1391583938" MODIFIED="1786417216873" TEXT="Verwende SVG vom letzten Jahr">
@@ -1316,8 +1329,7 @@
       devel/froscon/research/drawings/DemoApp.svg
     </p>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 </node>
 <node CREATED="1786417218690" ID="ID_1381822955" MODIFIED="1786417293609" TEXT="mache einen &#xbb;fliegenden Edit&#xab; und tausche den Text aus">
 <richcontent TYPE="NOTE"><html>
@@ -1329,8 +1341,7 @@
       ...alles ausgeblendet, au&#223;der dem einen Callback, den ich brauche; Seitengr&#246;&#223;e an neue Pr&#228;sentation angepa&#223;t, als PNG exportiert, in Libreoffice gelinkt
     </p>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 </node>
 <node BACKGROUND_COLOR="#e0ceaa" COLOR="#bd0711" CREATED="1786417231271" ID="ID_83397102" MODIFIED="1786417241997" TEXT="SVG nicht gespeichert">
 <icon BUILTIN="messagebox_warning"/>
@@ -1408,6 +1419,22 @@
 <node CREATED="1786364126177" ID="ID_1833162586" MODIFIED="1786364134602" TEXT="LIbreoffice-Impress">
 <node CREATED="1786364135443" ID="ID_1245717049" MODIFIED="1786364144906" TEXT="siehe allgemein in der Hau-zu-Mindmap"/>
 <node CREATED="1786364146398" ID="ID_432726701" LINK="https://help.libreoffice.org/latest/en-GB/text/simpress/guide/masterpage.html?DbPAR=IMPRESS" MODIFIED="1786364175659" TEXT="Online-Hilfe"/>
+<node CREATED="1723126573043" ID="ID_1986524075" MODIFIED="1723126582304" TEXT="F5 &quot;show presentation&quot;">
+<node CREATED="1786422111400" ID="ID_222051309" MODIFIED="1786422119237" TEXT="shift-F5: start at current slide"/>
+<node BACKGROUND_COLOR="#f9eabd" CREATED="1786422119842" ID="ID_1331826043" MODIFIED="1786422182253" TEXT="Alt+PgUp/Down : skip to next slide">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      skip all animations and start with next / previous slide
+    </p>
+  </body>
+</html></richcontent>
+<icon BUILTIN="idea"/>
+</node>
+</node>
 </node>
 <node CREATED="1786364181361" ID="ID_1043221954" MODIFIED="1786364191451" TEXT="Gesamtbild">
 <node CREATED="1786364192456" ID="ID_1575148140" MODIFIED="1786364232263" TEXT="Template-Pr&#xe4;sentation : TalkTemplate.otp">
@@ -1433,8 +1460,7 @@
       </li>
     </ul>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 </node>
 <node CREATED="1786364317451" ID="ID_565586898" MODIFIED="1786364339330" TEXT="man kann Slides &#xfc;bertragen">
 <richcontent TYPE="NOTE"><html>
@@ -1446,8 +1472,7 @@
       drag-n-drop, oder Slide &gt; Import from File
     </p>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 </node>
 </node>
 <node CREATED="1786366509057" ID="ID_525698459" MODIFIED="1786366514107" TEXT="Transitions">
@@ -1480,8 +1505,7 @@
       es ergeben sich daraus die Pixel
     </p>
   </body>
-</html>
-</richcontent>
+</html></richcontent>
 </node>
 <node CREATED="1786416853832" ID="ID_178516863" MODIFIED="1786416858007" TEXT="Display-units: px"/>
 </node>
@@ -1579,6 +1603,9 @@
   </body>
 </html></richcontent>
 <linktarget COLOR="#1e73d8" DESTINATION="ID_1509171837" ENDARROW="Default" ENDINCLINATION="-101;10;" ID="Arrow_ID_202998793" SOURCE="ID_1555871563" STARTARROW="None" STARTINCLINATION="73;6;"/>
+<node CREATED="1786458907526" ID="ID_1713197876" LINK="https://www.lumiera.org/research/ioUring/index.html" MODIFIED="1786458953424" TEXT="Sub-Page: ioUring">
+<linktarget COLOR="#7595a3" DESTINATION="ID_1713197876" ENDARROW="Default" ENDINCLINATION="-227;-574;" ID="Arrow_ID_1359881181" SOURCE="ID_1841666778" STARTARROW="None" STARTINCLINATION="-579;46;"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#d2beaf" COLOR="#5c4d6e" CREATED="1755783744974" ID="ID_869839202" LINK="git://git.lumiera.org/extra/video-output.git" MODIFIED="1779389837517">
 <richcontent TYPE="NODE"><html>
@@ -1592,7 +1619,8 @@
 <icon BUILTIN="hourglass"/>
 </node>
 </node>
-<node CREATED="1755783306798" ID="ID_1759870777" MODIFIED="1779389857537" TEXT="QR-Code generieren">
+<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1755783306798" ID="ID_1759870777" MODIFIED="1786458962467" TEXT="QR-Code generieren">
+<icon BUILTIN="flag-pink"/>
 <node CREATED="1755783346775" ID="ID_1172562149" MODIFIED="1755783365282">
 <richcontent TYPE="NODE"><html>
   <head/>
@@ -5377,7 +5405,8 @@
 </node>
 </node>
 </node>
-<node CREATED="1785860391030" ID="ID_1841666778" MODIFIED="1785860400265" TEXT="Research-Sektion auf Lumiera.org">
+<node CREATED="1785860391030" ID="ID_1841666778" LINK="https://www.lumiera.org/research/ioUring/index.html" MODIFIED="1786458953423" TEXT="Research-Sektion auf Lumiera.org">
+<arrowlink COLOR="#7595a3" DESTINATION="ID_1713197876" ENDARROW="Default" ENDINCLINATION="-227;-574;" ID="Arrow_ID_1359881181" STARTARROW="None" STARTINCLINATION="-579;46;"/>
 <node CREATED="1785860406146" ID="ID_17114163" MODIFIED="1785860420192" TEXT="Overview"/>
 <node CREATED="1785860425383" ID="ID_468739218" MODIFIED="1785860427904" TEXT="Resources">
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1785860434326" ID="ID_1458908971" MODIFIED="1785860443825" TEXT="TimeScales">
diff --git a/FrOSCon26/Talk-IOUring.odp b/FrOSCon26/Talk-IOUring.odp
index c93af0f..e05740a 100644
Binary files a/FrOSCon26/Talk-IOUring.odp and b/FrOSCon26/Talk-IOUring.odp differ
diff --git a/FrOSCon26/demoCodeQR.png b/FrOSCon26/demoCodeQR.png
new file mode 100644
index 0000000..aa477e3
Binary files /dev/null and b/FrOSCon26/demoCodeQR.png differ