diff --git a/blocks.js b/blocks.js
index bb09c386..1c64eb6a 100644
--- a/blocks.js
+++ b/blocks.js
@@ -149,7 +149,7 @@ BlockEditorMorph, localize, isNil*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2016-February-24';
+modules.blocks = '2016-March-16';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -2216,6 +2216,16 @@ BlockMorph.prototype.userMenu = function () {
         top,
         blck;
 
+    function addOption(label, toggle, test, onHint, offHint) {
+        var on = '\u2611 ',
+            off = '\u2610 ';
+        menu.addItem(
+            (test ? on : off) + localize(label),
+            toggle,
+            test ? onHint : offHint
+        );
+    }
+
     menu.addItem(
         "help...",
         'showHelp'
@@ -2236,7 +2246,15 @@ BlockMorph.prototype.userMenu = function () {
     }
     if (this.isTemplate) {
         if (!(this.parent instanceof SyntaxElementMorph)) {
-            if (this.selector !== 'evaluateCustomBlock') {
+            if (this.selector === 'reportGetVar') {
+                addOption(
+                    'transient',
+                    'toggleTransientVariable',
+                    myself.isTransientVariable(),
+                    'uncheck to save contents\nin the project',
+                    'check to prevent contents\nfrom being saved'
+                );
+            } else if (this.selector !== 'evaluateCustomBlock') {
                 menu.addItem(
                     "hide",
                     'hidePrimitive'
@@ -2430,6 +2448,20 @@ BlockMorph.prototype.hidePrimitive = function () {
     ide.refreshPalette();
 };
 
+BlockMorph.prototype.isTransientVariable = function () {
+    // private - only for variable getter template inside the palette
+    var varFrame = this.receiver().variables.silentFind(this.blockSpec);
+    return varFrame ? varFrame.vars[this.blockSpec].isTransient : false;
+};
+
+BlockMorph.prototype.toggleTransientVariable = function () {
+    // private - only for variable getter template inside the palette
+    var varFrame = this.receiver().variables.silentFind(this.blockSpec);
+    if (!varFrame) {return; }
+    varFrame.vars[this.blockSpec].isTransient =
+        !(varFrame.vars[this.blockSpec].isTransient);
+};
+
 BlockMorph.prototype.deleteBlock = function () {
     // delete just this one block, keep inputs and next block around
     var scripts = this.parentThatIsA(ScriptsMorph),
diff --git a/gui.js b/gui.js
index 9df9e632..f284adb2 100644
--- a/gui.js
+++ b/gui.js
@@ -69,7 +69,7 @@ XML_Element, WatcherMorph, BlockRemovalDialogMorph, saveAs, TableMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.gui = '2016-February-24';
+modules.gui = '2016-March-16';
 
 // Declarations
 
@@ -2524,6 +2524,17 @@ IDE_Morph.prototype.settingsMenu = function () {
         'check for sprite\ninheritance features',
         false
     );
+    addPreference(
+        'Persist linked sublist IDs',
+        function () {
+            StageMorph.prototype.enableSublistIDs =
+                !StageMorph.prototype.enableSublistIDs;
+        },
+        StageMorph.prototype.enableSublistIDs,
+        'uncheck to disable\nsaving linked sublist identities',
+        'check to enable\nsaving linked sublist identities',
+        true
+    );
     menu.popup(world, pos);
 };
 
@@ -2796,7 +2807,7 @@ IDE_Morph.prototype.aboutSnap = function () {
         module, btn1, btn2, btn3, btn4, licenseBtn, translatorsBtn,
         world = this.world();
 
-    aboutTxt = 'Snap! 4.0.5\nBuild Your Own Blocks\n\n'
+    aboutTxt = 'Snap! 4.0.6\nBuild Your Own Blocks\n\n'
         + 'Copyright \u24B8 2016 Jens M\u00F6nig and '
         + 'Brian Harvey\n'
         + 'jens@moenig.org, bh@cs.berkeley.edu\n\n'
@@ -3014,6 +3025,7 @@ IDE_Morph.prototype.newProject = function () {
     StageMorph.prototype.codeHeaders = {};
     StageMorph.prototype.enableCodeMapping = false;
     StageMorph.prototype.enableInheritance = false;
+    StageMorph.prototype.enableSublistIDs = false;
     SpriteMorph.prototype.useFlatLineEnds = false;
     this.setProjectName('');
     this.projectNotes = '';
@@ -3521,6 +3533,7 @@ IDE_Morph.prototype.rawOpenProjectString = function (str) {
     StageMorph.prototype.codeHeaders = {};
     StageMorph.prototype.enableCodeMapping = false;
     StageMorph.prototype.enableInheritance = false;
+    StageMorph.prototype.enableSublistIDs = false;
     if (Process.prototype.isCatchingErrors) {
         try {
             this.serializer.openProject(
@@ -3564,6 +3577,7 @@ IDE_Morph.prototype.rawOpenCloudDataString = function (str) {
     StageMorph.prototype.codeHeaders = {};
     StageMorph.prototype.enableCodeMapping = false;
     StageMorph.prototype.enableInheritance = false;
+    StageMorph.prototype.enableSublistIDs = false;
     if (Process.prototype.isCatchingErrors) {
         try {
             model = this.serializer.parse(str);
diff --git a/history.txt b/history.txt
index 5485ea59..4133bdae 100755
--- a/history.txt
+++ b/history.txt
@@ -2874,3 +2874,11 @@ end - bulk of 151215
 160306
 ------
 * Objects: Reenable custom hat blocks when dropping a sprite
+
+160316
+------
+* Store, Objects, GUI: fixed #99 (saving linked lists)
+* Objects: fixed #1163
+* added web api / https reporter library
+* Blocks, Store: New “transient variable” feature
+* German translation update
diff --git a/lang-de.js b/lang-de.js
index 9d013954..b52fb771 100644
--- a/lang-de.js
+++ b/lang-de.js
@@ -185,7 +185,7 @@ SnapTranslator.dict.de = {
     'translator_e-mail':
         'jens@moenig.org', // optional
     'last_changed':
-        '2016-02-24', // this, too, will appear in the Translators tab
+        '2016-03-16', // this, too, will appear in the Translators tab
 
     // GUI
     // control bar:
@@ -881,6 +881,12 @@ SnapTranslator.dict.de = {
         'Umringen',
     'unringify':
         'Entringen',
+    'transient':
+        'nicht persistent',
+    'uncheck to save contents\nin the project':
+        'ausschalten, um den Inhalt\nim Projekt zu speichern',
+    'check to prevent contents\nfrom being saved':
+        'einschalten, um das Speichern des Inhalts\nim Projekt zu verhindern',
 
     // custom blocks:
     'delete block definition...':
diff --git a/libraries/LIBRARIES b/libraries/LIBRARIES
index a326ce14..3ce9dd9c 100644
--- a/libraries/LIBRARIES
+++ b/libraries/LIBRARIES
@@ -2,6 +2,7 @@ iteration-composition.xml	Iteration, composition
 list-utilities.xml	List utilities
 stream-tools.xml	Streams (lazy lists)
 variadic-reporters.xml	Variadic reporters
+httpBlocks.xml	Web services access (https)
 word-sentence.xml	Words, sentences
 cases.xml	Multi-branched conditional (switch)
 leap-library.xml	LEAP Motion controller
diff --git a/libraries/httpBlocks.xml b/libraries/httpBlocks.xml
new file mode 100644
index 00000000..a0086960
--- /dev/null
+++ b/libraries/httpBlocks.xml
@@ -0,0 +1,4 @@
+<blocks app="Snap! 4.0, http://snap.berkeley.edu" version="1"><block-definition s="%&apos;method&apos; url: %&apos;url&apos; send: %&apos;payload&apos; headers: %&apos;headers&apos;" type="reporter" category="sensing"><header></header><code></code><inputs><input type="%s" readonly="true">GET<options>GET
+POST
+PUT
+DELETE</options></input><input type="%s">http://snap.berkeley.edu</input><input type="%s"></input><input type="%mult%l" readonly="true"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportJSFunction"><list><l>method</l><l>url</l><l>data</l><l>headers</l><l>proc</l></list><l>var response, i, header;&#xD;if (!proc.httpRequest) {&#xD;  proc.httpRequest = new XMLHttpRequest();&#xD;  proc.httpRequest.open(method, url, true);&#xD;  proc.assertType(headers, &apos;list&apos;);&#xD;  for (i = 1; i &lt;= headers.length(); i += 1) {&#xD;    header = headers.at(i);&#xD;    proc.assertType(header, &apos;list&apos;);&#xD;    proc.httpRequest.setRequestHeader(&#xD;      header.at(1),&#xD;      header.at(2)&#xD;    );&#xD;  }&#xD;  proc.httpRequest.send(data || null);&#xD;} else if (proc.httpRequest.readyState === 4) {&#xD;  response = proc.httpRequest.responseText;&#xD;  proc.httpRequest = null;&#xD;  return response;&#xD;}&#xD;proc.pushContext(&apos;doYield&apos;);&#xD;proc.pushContext();</l></block><list><block var="method"/><block var="url"/><block var="payload"/><block var="headers"/></list></block></block></script></block-definition><block-definition s="key: %&apos;key&apos; value: %&apos;value&apos;" type="reporter" category="operators"><header></header><code></code><inputs><input type="%s"></input><input type="%s"></input></inputs><script><block s="doReport"><block s="reportNewList"><list><block var="key"/><block var="value"/></list></block></block></script></block-definition></blocks>
\ No newline at end of file
diff --git a/locale.js b/locale.js
index eb0cc189..749df7fc 100644
--- a/locale.js
+++ b/locale.js
@@ -42,7 +42,7 @@
 
 /*global modules, contains*/
 
-modules.locale = '2016-February-24';
+modules.locale = '2016-March-16';
 
 // Global stuff
 
@@ -161,7 +161,7 @@ SnapTranslator.dict.de = {
     'translator_e-mail':
         'jens@moenig.org',
     'last_changed':
-        '2016-02-24'
+        '2016-03-16'
 };
 
 SnapTranslator.dict.it = {
diff --git a/objects.js b/objects.js
index 8a58df8a..f7314b07 100644
--- a/objects.js
+++ b/objects.js
@@ -82,7 +82,7 @@ SpeechBubbleMorph, RingMorph, isNil, FileReader, TableDialogMorph,
 BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph, localize,
 TableMorph, TableFrameMorph*/
 
-modules.objects = '2016-March-06';
+modules.objects = '2016-March-16';
 
 var SpriteMorph;
 var StageMorph;
@@ -2423,7 +2423,7 @@ SpriteMorph.prototype.blocksMatching = function (
 
     // variable getters
     varNames.forEach(function (vName) {
-        var rel = relevance(labelOf(vName), search);
+        var rel = relevance(labelOf(vName.toLowerCase()), search);
         if (rel !== -1) {
             blocks.push([myself.variableBlock(vName), rel + '1']);
         }
@@ -4726,6 +4726,7 @@ StageMorph.prototype.codeMappings = {};
 StageMorph.prototype.codeHeaders = {};
 StageMorph.prototype.enableCodeMapping = false;
 StageMorph.prototype.enableInheritance = false;
+StageMorph.prototype.enableSublistIDs = false;
 
 // StageMorph instance creation
 
diff --git a/store.js b/store.js
index 9a636c81..3b663907 100644
--- a/store.js
+++ b/store.js
@@ -60,7 +60,7 @@ SyntaxElementMorph, Variable*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.store = '2016-February-24';
+modules.store = '2016-March-16';
 
 
 // XML_Serializer ///////////////////////////////////////////////////////
@@ -414,6 +414,8 @@ SnapSerializer.prototype.rawLoadProjectModel = function (xmlNode) {
         model.stage.attributes.codify === 'true';
     StageMorph.prototype.enableInheritance =
         model.stage.attributes.inheritance === 'true';
+    StageMorph.prototype.enableSublistIDs =
+        model.stage.attributes.sublistIDs === 'true';
 
     model.hiddenPrimitives = model.project.childNamed('hidden');
     if (model.hiddenPrimitives) {
@@ -773,13 +775,15 @@ SnapSerializer.prototype.loadVariables = function (varFrame, element) {
     var myself = this;
 
     element.children.forEach(function (child) {
-        var value;
+        var v, value;
         if (child.tag !== 'variable') {
             return;
         }
         value = child.children[0];
-        varFrame.vars[child.attributes.name] = new Variable(value ?
-                myself.loadValue(value) : 0);
+        v = new Variable();
+        v.isTransient = (child.attributes.transient === 'true');
+        v.value = (v.isTransient || !value ) ? 0 : myself.loadValue(value);
+        varFrame.vars[child.attributes.name] = v;
     });
 };
 
@@ -1121,7 +1125,7 @@ SnapSerializer.prototype.loadInput = function (model, input, block) {
 
 SnapSerializer.prototype.loadValue = function (model) {
     // private
-    var v, items, el, center, image, name, audio, option,
+    var v, lst, items, el, center, image, name, audio, option,
         myself = this;
 
     function record() {
@@ -1157,28 +1161,29 @@ SnapSerializer.prototype.loadValue = function (model) {
         return model.contents === 'true';
     case 'list':
         if (model.attributes.hasOwnProperty('linked')) {
+            v = new List();
+            v.isLinked = true;
+            record();
+            lst = v;
             items = model.childrenNamed('item');
-            if (items.length === 0) {
-                v = new List();
-                record();
-                return v;
-            }
             items.forEach(function (item) {
                 var value = item.children[0];
-                if (v === undefined) {
-                    v = new List();
-                    record();
-                } else {
-                    v = v.rest = new List();
-                }
-                v.isLinked = true;
                 if (!value) {
                     v.first = 0;
                 } else {
                     v.first = myself.loadValue(value);
                 }
+                var tail = model.childNamed('list') ||
+                    model.childNamed('ref');
+                if (tail) {
+                    v.rest = myself.loadValue(tail);
+                } else {
+                    v.rest = new List();
+                    v = v.rest;
+                    v.isLinked = true;
+                }
             });
-            return v;
+            return lst;
         }
         v = new List();
         record();
@@ -1446,6 +1451,7 @@ StageMorph.prototype.toXML = function (serializer) {
             'lines="@" ' +
             'codify="@" ' +
             'inheritance="@" ' +
+            'sublistIDs="@" ' +
             'scheduled="@" ~>' +
             '<pentrails>$</pentrails>' +
             '<costumes>%</costumes>' +
@@ -1474,6 +1480,7 @@ StageMorph.prototype.toXML = function (serializer) {
         SpriteMorph.prototype.useFlatLineEnds ? 'flat' : 'round',
         this.enableCodeMapping,
         this.enableInheritance,
+        this.enableSublistIDs,
         StageMorph.prototype.frameRate !== 0,
         this.trailsCanvas.toDataURL('image/png'),
         serializer.store(this.costumes, this.name + '_cst'),
@@ -1587,7 +1594,12 @@ VariableFrame.prototype.toXML = function (serializer) {
     return Object.keys(this.vars).reduce(function (vars, v) {
         var val = myself.vars[v].value,
             dta;
-        if (val === undefined || val === null) {
+        if (myself.vars[v].isTransient) {
+            dta = serializer.format(
+                '<variable name="@" transient="true"/>',
+                v)
+            ;
+        } else if (val === undefined || val === null) {
             dta = serializer.format('<variable name="@"/>', v);
         } else {
             dta = serializer.format(
@@ -1875,19 +1887,46 @@ ColorSlotMorph.prototype.toXML = function (serializer) {
 List.prototype.toXML = function (serializer, mediaContext) {
     // mediaContext is an optional name-stub
     // when collecting media into a separate module
-    var xml, item;
+    var xml, value, item;
     if (this.isLinked) {
         xml = '<list linked="linked" ~>';
+        if (StageMorph.prototype.enableSublistIDs) {
+            // recursively nest tails:
+            value = this.first;
+            if (!isNil(value)) {
+                xml += serializer.format(
+                    '<item>%</item>',
+                    typeof value === 'object' ?
+                            serializer.store(value, mediaContext)
+                            : typeof value === 'boolean' ?
+                                    serializer.format('<bool>$</bool>', value)
+                                    : serializer.format('<l>$</l>', value)
+                );
+            }
+            if (!isNil(this.rest)) {
+                xml += serializer.store(this.rest, mediaContext);
+            }
+            return xml + '</list>';
+        }
+        // else sequentially serialize tails:
         item = this;
         do {
-            xml += serializer.format(
-                '<item>%</item>',
-                serializer.store(item.first)
-            );
+            value = item.first;
+            if (!isNil(value)) {
+                xml += serializer.format(
+                    '<item>%</item>',
+                    typeof value === 'object' ?
+                            serializer.store(value, mediaContext)
+                            : typeof value === 'boolean' ?
+                                    serializer.format('<bool>$</bool>', value)
+                                    : serializer.format('<l>$</l>', value)
+                );
+            }
             item = item.rest;
-        } while (item !== undefined && (item !== null));
+        } while (!isNil(item));
         return xml + '</list>';
     }
+    // dynamic array:
     return serializer.format(
         '<list ~>%</list>',
         this.contents.reduce(function (xml, item) {
@@ -1903,7 +1942,6 @@ List.prototype.toXML = function (serializer, mediaContext) {
     );
 };
 
-
 Context.prototype.toXML = function (serializer) {
     if (this.isContinuation) { // continuations are transient in Snap!
         return '';
diff --git a/threads.js b/threads.js
index ea2d9ccc..85124149 100644
--- a/threads.js
+++ b/threads.js
@@ -61,7 +61,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy,
 isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph,
 TableFrameMorph*/
 
-modules.threads = '2016-February-24';
+modules.threads = '2016-March-16';
 
 var ThreadManager;
 var Process;
@@ -3240,16 +3240,18 @@ Context.prototype.stackSize = function () {
 
 // Variable /////////////////////////////////////////////////////////////////
 
-function Variable(value) {
+function Variable(value, isTransient) {
     this.value = value;
+    this.isTransient = isTransient || false; // prevent value serialization
 }
 
 Variable.prototype.toString = function () {
-    return 'a Variable [' + this.value + ']';
+    return 'a ' + this.isTransient ? 'transient ' : '' + 'Variable [' +
+        this.value + ']';
 };
 
 Variable.prototype.copy = function () {
-    return new Variable(this.value);
+    return new Variable(this.value, this.isTransient);
 };
 
 // VariableFrame ///////////////////////////////////////////////////////