diff -r 2efd269b3eb8 Lib/idlelib/EditorWindow.py
--- a/Lib/idlelib/EditorWindow.py	Sun Sep 20 23:17:41 2015 +0500
+++ b/Lib/idlelib/EditorWindow.py	Sun Sep 20 17:56:54 2015 -0400
@@ -21,6 +21,7 @@
 from idlelib.configHandler import idleConf
 from idlelib import aboutDialog, textView, configDialog
 from idlelib import macosxSupport
+from idlelib import help
 
 # The default tab setting for a Text widget, in average-width characters.
 TK_TABWIDTH_DEFAULT = 8
@@ -42,6 +43,11 @@
 class HelpDialog(object):
 
     def __init__(self):
+        import warnings as w
+        w.warn("EditorWindow.HelpDialog is no longer used by Idle.\n"
+               "It will be removed in 3.6 or later.\n"
+               "It has been replaced by private help.HelpWindow\n",
+               DeprecationWarning, stacklevel=2)
         self.parent = None      # parent of help window
         self.dlg = None         # the help window iteself
 
@@ -539,11 +545,13 @@
         configDialog.ConfigExtensionsDialog(self.top)
 
     def help_dialog(self, event=None):
+        "Handle help doc event."
+        # edit maxosxSupport.overrideRootMenu.help_dialog to match
         if self.root:
             parent = self.root
         else:
             parent = self.top
-        helpDialog.display(parent, near=self.top)
+        help.show_idlehelp(parent)
 
     def python_docs(self, event=None):
         if sys.platform[:3] == 'win':
@@ -1716,4 +1724,4 @@
 
 if __name__ == '__main__':
     from idlelib.idle_test.htest import run
-    run(_help_dialog, _editor_window)
+    run(_editor_window)
diff -r 2efd269b3eb8 Lib/idlelib/help.txt
--- a/Lib/idlelib/help.txt	Sun Sep 20 23:17:41 2015 +0500
+++ b/Lib/idlelib/help.txt	Sun Sep 20 17:56:54 2015 -0400
@@ -1,3 +1,7 @@
+This file, idlelib/help.txt is out-of-date and no longer used by Idle.
+It is deprecated and will be removed in the future, possibly in 3.6
+----------------------------------------------------------------------
+
 [See the end of this file for ** TIPS ** on using IDLE !!]
 
 IDLE is the Python IDE built with the tkinter GUI toolkit.
diff -r 2efd269b3eb8 Lib/idlelib/idle_test/htest.py
--- a/Lib/idlelib/idle_test/htest.py	Sun Sep 20 23:17:41 2015 +0500
+++ b/Lib/idlelib/idle_test/htest.py	Sun Sep 20 17:56:54 2015 -0400
@@ -194,13 +194,6 @@
            "should open that file \nin a new EditorWindow."
     }
 
-_help_dialog_spec = {
-    'file': 'EditorWindow',
-    'kwds': {},
-    'msg': "If the help text displays, this works.\n"
-           "Text is selectable. Window is scrollable."
-    }
-
 _io_binding_spec = {
     'file': 'IOBinding',
     'kwds': {},
@@ -279,6 +272,13 @@
            "Right clicking an item will display a popup."
     }
 
+show_idlehelp_spec = {
+    'file': 'help',
+    'kwds': {},
+    'msg': "If the help text displays, this works.\n"
+           "Text is selectable. Window is scrollable."
+    }
+
 _stack_viewer_spec = {
     'file': 'StackViewer',
     'kwds': {},
diff -r 2efd269b3eb8 Lib/idlelib/macosxSupport.py
--- a/Lib/idlelib/macosxSupport.py	Sun Sep 20 23:17:41 2015 +0500
+++ b/Lib/idlelib/macosxSupport.py	Sun Sep 20 17:56:54 2015 -0400
@@ -174,9 +174,8 @@
         configDialog.ConfigDialog(root, 'Settings')
 
     def help_dialog(event=None):
-        from idlelib import textView
-        fn = path.join(path.abspath(path.dirname(__file__)), 'help.txt')
-        textView.view_file(root, 'Help', fn)
+        from idlelib import help
+        help.show_idlehelp(root)
 
     root.bind('<<about-idle>>', about_dialog)
     root.bind('<<open-config-dialog>>', config_dialog)