diff --git a/lib/x11/corereqs.js b/lib/x11/corereqs.js
index 080fc1d..d279825 100644
--- a/lib/x11/corereqs.js
+++ b/lib/x11/corereqs.js
@@ -164,10 +164,38 @@ module.exports = {
 
    ],
 
+   ChangeWindowAttributes:[
+       function(wid, values) {
+           var format = 'CxSLL';           
+           var packetLength = 3 + (values ? Object.keys(values).length : 0);
+           var vals = packValueMask('CreateWindow', values);
+           var args = [2, packetLength, wid, vals[0]];
+           var valArr = vals[1];
+           for (v in valArr)
+           {
+               format += 'L'; 
+               args.push(valArr[v]);
+           }           
+           return [format, args];
+        }
+   ],
+
    DestroyWindow: [
        [ 'CxSL', [4, 2] ]
    ],
 
+   ChangeSaveSet: [
+      function(isInsert, wid)
+      {
+          return [ 'CCSL', [6, (isInsert ? 0 : 1), 2, wid]]
+      }
+   ],
+
+   // wid, newParentId, x, y
+   ReparentWindow: [
+       [ 'CxSLLss', [7, 4]]
+   ],
+
    MapWindow: [
        // 8 - opcode, 2 - length, wid added as parameter
        [ 'CxSL', [8, 2] ]
@@ -178,7 +206,7 @@ module.exports = {
    ],
 
 
-   // TODO: remove? this is actually a ConfigureWindow request 
+   // TODO: remove or leave as a convinient helper? this is actually a ConfigureWindow request 
    // with width and height argiments & arguments mask
    ResiseWindow: [
         function(win, width, height) {
@@ -186,6 +214,21 @@ module.exports = {
         }
    ],
 
+   QueryTree: [
+        ['CxSL', [15, 2]],
+
+        function(buf) {
+            var tree = {};
+            var res = buf.unpack('LLS');
+            tree.root = res[0];
+            tree.parent = res[1];
+            tree.children = [];
+            for (var i=0; i < res[2]; ++i)
+                tree.children.push(buf.unpack('L', 24 + i*4)[0]);
+            return tree;
+        }        
+   ],
+
    // opcode 16
    InternAtom: [
        function (returnOnlyIfExist, value)