add two way IPC

src/core/Microsoft.PowerToys.Settings.UI.Runner/App.xaml

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+<Application x:Class="Microsoft.PowerToys.Settings.UI.Runner.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

src/core/Microsoft.PowerToys.Settings.UI.Runner/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Microsoft.PowerToys.Settings.UI.Runner
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

src/core/Microsoft.PowerToys.Settings.UI.Runner/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

src/core/Microsoft.PowerToys.Settings.UI.Runner/MainWindow.xaml

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+<Window x:Class="Microsoft.PowerToys.Settings.UI.Runner.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Microsoft.PowerToys.Settings.UI.Runner"
+        xmlns:Controls="clr-namespace:Microsoft.Toolkit.Wpf.UI.Controls;assembly=Microsoft.Toolkit.Wpf.UI.Controls"
+        xmlns:xaml="clr-namespace:Microsoft.Toolkit.Wpf.UI.XamlHost;assembly=Microsoft.Toolkit.Wpf.UI.XamlHost"
+        mc:Ignorable="d"
+        Title="PowerToys Settings" Height="800" Width="1000">
+    <Grid>
+        <xaml:WindowsXamlHost InitialTypeName="Microsoft.PowerToys.Settings.UI.Views.ShellPage" ChildChanged="WindowsXamlHost_ChildChanged" />
+    </Grid>
+</Window>
+

src/core/Microsoft.PowerToys.Settings.UI.Runner/MainWindow.xaml.cs

@@ -0,0 +1,31 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Windows;
+using Microsoft.PowerToys.Settings.UI.Views;
+using Microsoft.Toolkit.Wpf.UI.XamlHost;
+
+namespace Microsoft.PowerToys.Settings.UI.Runner
+{
+    // Interaction logic for MainWindow.xaml.
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            this.InitializeComponent();
+        }
+
+        private void WindowsXamlHost_ChildChanged(object sender, EventArgs e)
+        {
+            // Hook up x:Bind source.
+            WindowsXamlHost windowsXamlHost = sender as WindowsXamlHost;
+            ShellPage shellPage = windowsXamlHost.GetUwpInternalObject() as ShellPage;
+
+            if (shellPage != null)
+            {
+            }
+        }
+    }
+}

src/core/Microsoft.PowerToys.Settings.UI.Runner/Microsoft.PowerToys.Settings.UI.Runner.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <StartupObject>Microsoft.PowerToys.Settings.UI.Runner.Program</StartupObject>
+    <Authors>Microsoft Corporation</Authors>
+    <Product>PowerToys</Product>
+    <Description>Windows system utilities to maximize productivity</Description>
+    <Company>Microsoft Corporation</Company>
+    <PackageIcon>logo.png</PackageIcon>
+    <PackageIconUrl />
+    <RepositoryUrl>https://github.com/microsoft/PowerToys</RepositoryUrl>
+    <RepositoryType>Github</RepositoryType>
+    <PackageTags>PowerToys</PackageTags>
+    <Version>0.15.2.0</Version>
+    <Platforms>x64</Platforms>
+    <ApplicationIcon>icon.ico</ApplicationIcon>
+    <Win32Resource />
+    
+    <!-- crutkas TODO: added for fallback, may need to be removed for WinUI3 -->
+    <AssetTargetFallback>uap10.0.18362</AssetTargetFallback>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <OutputPath>..\..\..\$(Platform)\$(Configuration)\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <OutputPath>..\..\..\$(Platform)\$(Configuration)\</OutputPath>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <AdditionalFiles Include="..\..\codeAnalysis\StyleCop.json" Link="StyleCop.json" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <COMReference Include="TwoWayIPCLibLib.dll">
+      <Guid>7e00d5a3-11df-45c1-a675-96e408bd5bf5</Guid>
+      <VersionMajor>1</VersionMajor>
+      <VersionMinor>0</VersionMinor>
+      <Lcid>0</Lcid>
+      <WrapperTool>tlbimp</WrapperTool>
+      <Isolated>false</Isolated>
+    </COMReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="..\settingsui\Assets\logo.png">
+      <Pack>True</Pack>
+      <PackagePath></PackagePath>
+    </None>
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Toolkit.Wpf.UI.Controls" Version="6.0.0" />
+    <PackageReference Include="Microsoft.Toolkit.Wpf.UI.XamlHost" Version="6.0.0" />
+    <PackageReference Include="StyleCop.Analyzers" Version="1.1.118">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Microsoft.PowerToys.Settings.UI\Microsoft.PowerToys.Settings.UI.csproj" />
+  </ItemGroup>
+
+</Project>

src/core/Microsoft.PowerToys.Settings.UI.Runner/Program.cs

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+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Windows;
+using TwoWayIPCLibLib;
+
+namespace Microsoft.PowerToys.Settings.UI.Runner
+{
+    public class Program
+    {
+        // Create an instance of the  IPC wrapper.
+        private static ITwoWayIPCManager ipcmanager = new TwoWayIPCManager();
+
+        [STAThreadAttribute()]
+        public static void Main(string[] args)
+        {
+            using (new UI.App())
+            {
+                App app = new App();
+                app.InitializeComponent();
+
+                if (args.Length > 1)
+                {
+                    ipcmanager.Initialize(args[1], args[0]);
+                    app.Run();
+                }
+                else
+                {
+                    MessageBox.Show(
+                        "The application cannot be run as a standalone process. Please start the application through the runner.",
+                        "Forbidden",
+                        MessageBoxButton.OK);
+                    app.Shutdown();
+                }
+            }
+        }
+
+        public static ITwoWayIPCManager GetTwoWayIPCManager()
+        {
+            return ipcmanager;
+        }
+    }
+}