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@@ -91,3 +91,31 @@ A subset of these components is listed by default in the [Dependency Manager](..
 
 
 
+- [**System workers**](../API/SystemWorkerClass.md) allow the 4D code to call any external process (a shell command, PHP, any script, etc.) and monitor its execution.
+- [**SQL commands**](../commands/theme/SQL) allow you to connect and use various SQL data sources.
+- The [**built-in HTTP client**](../API/HTTPRequestClass.md) can request any HTTP server and process data.
+- [**Web Areas**](../FormObjects/webArea_overview.md) can give access to web pages or various HTML contents within your forms.  
+- [**Components**](Concepts/components.md). Components are made of 4D code. 4D proposes a set of utility components (see below) that you can install and use depending on your needs. You can also [develop your own 4D components](develop-components.md), or use third-party components. Many developers from the 4D community have shared 4D components (browse Github to have a list of public 4D components gathered with the [`4d-component`](https://github.com/topics/4d-component) topic). 
+- [**Plug-ins**](../Concepts/plug-ins.md). Plug-ins can be built using any language. Plugins do things that 4D does not natively (e.g., specific platform technology), or would be very hard to write just using 4D. As described in [this page](develop-plug-ins.md), you can develop your own plug-ins. A lot of functionnalities are covered by the existing 4D plug-ins. Browse Github to have a list of public 4D plugins gathered with the [`4d-plugin`](https://github.com/topics/4d-plugin) topic.
+
+
+## Components developed by 4D
+
+4D proposes various components to the 4D community, covering many development needs. All 4D components can be found on the [**4D github repository**](https://github.com/4d).
+
+A subset of these components is listed by default in the [Dependency Manager](../Project/components.md), including:
+
+|Component|Github repository|Description|Main Features| 
+|---|---|---|---|
+|4D AIKit|https://github.com/4d/4D-AIKit|Set of classes to connect to third-party OpenAI APIs|`OpenAIChat`, `OpenAIImage`...|
+|4D NetKit|https://github.com/4d/4D-NetKit|Set of web service tools to connect to third-party APIs|`OAuth2Provider` class, `New OAuth2 provider`, `OAuth2ProviderObject.getToken()` |
+|4D Progress|https://github.com/4d/4D-Progress|Open one or more progress bars in the same window|`Progress New`, `Progress SET ON STOP METHOD`, `Progress SET PROGRESS`, ... |
+|4D QPDF|https://github.com/4d/4D-QPDF|Extract attachments from PDF/A-3 files|`PDF Get attachments` |
+|4D SVG|https://github.com/4d/4D-SVG|Create and manipulate common svg graphic objects|`SVGTool_Display_viewer`, multiple `SVG_` methods |
+|4D ViewPro|https://github.com/4d/4d-view-pro|Spreadsheet features in your forms|See [4D View Pro documentation](ViewPro/getting-started.md)|
+|4D Widgets|https://github.com/4d/4D-Widgets|Manage DatePicker, TimePicker, SearchPicker 4D widgets|`DatePicker calendar`, `DateEntry area`, `TimeEntry`, `SearchPicker SET HELP TEXT`, ...|
+|4D WritePro Interface|https://github.com/4d/4D-WritePro-Interface|Manage 4D Write Pro palettes and [table wizard](../WritePro/writeprointerface.md)|`WP PictureSettings`, `WP ShowTabPages`, `WP SwitchToolbar`, `WP UpdateWidget`|
+|Build4D|https://github.com/4d-depot/Build4D|Compile, build, and sign projects|CI/CD |
+
+
+
@@ -33,6 +33,35 @@ Read [**What’s new in 4D 21**](https://blog.4d.com/en-whats-new-in-4d-21/), th
 [**Fluent UI** rendering for 4D forms](../FormEditor/forms.md#fluent-ui-rendering-developer-preview) is proposed in Developer Preview during the beta test program. 
 
 
+#### Behavior changes
+
+:::caution Index rebuild
+
+4D 21 includes an ICU library update ([see below](#library-table)) which will force an automatic rebuild of indexes of type alpha, text, and object. Depending on the size of the data file, this operation can take a while and may require to be planned.
+
+:::
+
+- Web services (SOAP): when [scalable sessions](../WebServer/sessions.md#enabling-web-sessions) are enabled, web services now run in [**preemptive processes**](../Develop/preemptive.md) in compiled mode. Make sure your SOAP code is thread-safe. 
+- Web server: the support of deprecated `4DSYNC/` and `4DCGI/` URLs is removed. No specific processing is done on these URLs anymore. 
+- Web user sessions are now returned by [`Process activity`](../commands/process-activity.md).
+- The [`HIGHLIGHT TEXT`](../commands/highlight-text) command is now supported in the context of subforms.
+- **Components no longer embedded**: starting with 4D 21, components developed by 4D (4D NetKit, 4D SVG..., see [this list](../Extensions/overview.md#components-developed-by-4d)) are no longer embedded in the 4D application. When upgrading a project to 4D 21 or higher, a dialog box is displayed:<br/> 
+![alt-text](../assets/en/getStart/convert.png)<br/>
+	  - **Import**: import automatically 4D components as dependencies to the project<br/>
+	  - **Ignore**: do not import components and let you [manage components manually](../Project/components.md)<br/>
+	  - **Ask later**: do not import components and display the dialog at the next project opening.  
+
+:::note
+
+In binary databases, you need to select the required components in the 4D installer or download them from the [4D Product Download portal](https://product-download.4d.com/?type=components).
+
+:::
+
+#### Developer Preview
+
+[**Fluent UI** rendering for 4D forms](../FormEditor/forms.md#fluent-ui-rendering-developer-preview) is proposed in Developer Preview during the beta test program. 
+
+
 #### Behavior changes
 
 :::caution Index rebuild
 
@@ -70,12 +70,17 @@ The following action keywords are supported:
 
 ### Non-modifiable headers
 
-The following headers could not be modified by the `removeHeaders`, `setHeaders`, or `addHeaders` actions: 
+Some headers could not be added, modified or removed: 
 
-- "Date", 
-- "Content-Length"
+|Header|Add|Set|Remove|
+|---|---|---|---|
+|Date|No|No|No|
+|Content-Length|No|No|No|
+|Content-Encoding|No|No|No|
+|Vary|Yes|No|No|
+|Set-Cookie|Yes|Add cookie|No|
 
-Modifying these headers do not generate errors, however modifications will be ignored.   
+Unauthorized changes on these headers do not generate errors, however modifications will be ignored. 
 
 ### Current rules
 
 
@@ -313,6 +313,8 @@ However, you can install a [component error handler in the host application](../
 
 However, you can install a [component error handler in the host application](../Concepts/error-handling.md#scope-and-components) to manage uncaught errors from compponents.
 
+However, you can install a [component error handler in the host application](../Concepts/error-handling.md#scope-and-components) to manage uncaught errors from compponents.
+
 ## Acceso a las tablas del proyecto local
 
 Aunque los componentes no pueden utilizar tablas, los punteros pueden permitir que los proyectos locales y los componentes se comuniquen entre sí. Por ejemplo, este es un método que podría ser llamado desde un componente:
 
@@ -141,6 +141,34 @@ In binary databases, you need to select the required components in the 4D instal
 
 :::
 
+#### Vista previa para desarrolladores
+
+[**Fluent UI** rendering for 4D forms](../FormEditor/forms.md#fluent-ui-rendering-developer-preview) is proposed in Developer Preview during the beta test program.
+
+#### Cambios de comportamiento
+
+:::caution Index rebuild
+
+4D 21 includes an ICU library update ([see below](#library-table)) which will force an automatic rebuild of indexes of type alpha, text, and object. Dependiendo del tamaño del archivo de datos, esta operación puede llevar un tiempo y puede ser necesario planificarla.
+
+:::
+
+- Web services (SOAP): when [scalable sessions](../WebServer/sessions.md#enabling-web-sessions) are enabled, web services now run in [**preemptive processes**](../Develop/preemptive.md) in compiled mode. Make sure your SOAP code is thread-safe.
+- Web server: the support of deprecated `4DSYNC/` and `4DCGI/` URLs is removed. Ya no se realiza ningún tratamiento específico en estas URL.
+- Web user sessions are now returned by [`Process activity`](../commands/process-activity.md).
+- The [`HIGHLIGHT TEXT`](../commands/highlight-text) command is now supported in the context of subforms.
+- **Components no longer embedded**: starting with 4D 21, components developed by 4D (4D NetKit, 4D SVG..., see [this list](../Extensions/overview-old.md)) are no longer embedded in the 4D application. When upgrading a project to 4D 21 or higher, a dialog box is displayed:<br/>
+  ![alt-text](../assets/en/getStart/convert.png)<br/>
+  \- **Import**: import automatically 4D components as dependencies to the project<br/>
+  \- **Ignore**: do not import components and let you [manage components manually](../Project/components.md)<br/>
+  \- **Ask later**: do not import components and display the dialog at the next project opening.
+
+:::note
+
+In binary databases, you need to select the required components in the 4D installer or download them from the [4D Product Download portal](https://product-download.4d.com/?type=components).
+
+:::
+
 ## 4D 20 R10
 
 Lea las [**Novedades en 4D 20 R10**](https://blog.4d.com/en-whats-new-in-4d-20-R10/), la entrada del blog que muestra todas las nuevas funcionalidades y mejoras en 4D 20 R10.
 
@@ -64,7 +64,7 @@ Este archivo de texto también puede contener llaves de configuración, en parti
 | filters.json                                 | Filtros definidos                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | JSON    |
 | dependencies.json                            | Nombres de [componentes a cargar](components.md) en el proyecto                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | JSON    |
 | HTTPHandlers.json                            | Personalizado [HTTP request handlers](../WebServer/http-request-handler.md) definido para el servidor web                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | JSON    |
-| HTTPRules.json                               | Custom [HTTP response headers](../WebServer/http-responses.md) defined for the web server                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | JSON    |
+| HTTPRules.json                               | Custom [HTTP rules](../WebServer/http-rules.md) defined for the web server                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | JSON    |
 | styleSheets.css                              | Hojas de estilo CSS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | CSS     |
 | styleSheets_mac.css     | Hojas de estilo css de Mac (a partir de una base binaria convertida)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | CSS     |
 | styleSheets_windows.css | Hojas de estilo css en Windows (a partir de una base binaria convertida)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | CSS     |
 
@@ -50,6 +50,17 @@ Use these callback properties for more granular control over success and error h
 
 See [documentation about asynchronous code for examples](../asynchronous-call.md)
 
+Use these callback properties for more granular control over success and error handling:
+
+| Propiedad    | Tipo                        | Descripción                                                                                                                                                       |
+| ------------ | --------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `onResponse` | 4D.Function | A function to be called asynchronously when the request finishes **successfully**. Asegúrese de que el proceso actual no termina. |
+| `onError`    | 4D.Function | A function to be called asynchronously when the request finishes **with errors**. Asegúrese de que el proceso actual no termina.  |
+
+> The callback function will receive the same result object type (one of [OpenAIResult](./OpenAIResult.md) child classes) that would be returned by the function in synchronous code.
+
+See [documentation about asynchronous code for examples](../asynchronous-call.md)
+
 ### Propiedades de la red
 
 | Propiedad      | Tipo      | Descripción                                                                                                                                                          |
 
@@ -1,6 +1,7 @@
 ---
 id: listbox-get-property
 title: LISTBOX Get property
+displayed_sidebar: docs
 ---
 
 <!--REF #_command_.LISTBOX Get property.Syntax-->**LISTBOX Get property** ( {* ;} *object* ; *property* ) : any<!-- END REF-->
 
@@ -1,6 +1,7 @@
 ---
 id: listbox-set-property
 title: LISTBOX SET PROPERTY
+displayed_sidebar: docs
 ---
 
 <!--REF #_command_.LISTBOX SET PROPERTY.Syntax-->**LISTBOX SET PROPERTY** ( {* ;} *object* ; *property* ; *value* )<!-- END REF-->
 
@@ -1,6 +1,7 @@
 ---
 id: object-get-data-source-formula
 title: OBJECT Get data source formula
+displayed_sidebar: docs
 ---
 
 <!--REF #_command_.OBJECT Get data source formula.Syntax-->**OBJECT Get data source formula** ( {* ;} *object* ) : 4D.Formula<!-- END REF-->