1# Process Model (Stage Model) 2 3 4The process model is shown below. 5 6 7- All UIAbility, ServiceExtensionAbility, and DataShareExtensionAbility components of an application (with the same bundle name) run in an independent process, which is **Main process** in green in the figure. 8- All ExtensionAbility components of the same type (except ServiceExtensionAbility and DataShareExtensionAbility) of an application (with the same bundle name) run in an independent process, such as **FormExtensionAbility process**, **InputMethodExtensionAbility process**, and other **ExtensionAbility process** in blue in the figure. 9- WebView has an independent render process, which is **Render process** in yellow in the figure. 10 11**Figure 1** Process model 12 13 14 15> **NOTE** 16> 17> - You can create ServiceExtensionAbility and DataShareExtensionAbility only for system applications. 18> - To view information about all running processes, run the **hdc shell** command to enter the shell CLI of the device, and run the **ps -ef** command. 19 20A system application can apply for multi-process permissions (as shown in the following figure) and configure a custom process for an HAP. UIAbility, DataShareExtensionAbility, and ServiceExtensionAbility in the HAP run in the custom process. Different HAPs run in different processes by configuring different process names. 21 22**Figure 2** Multi-process 23 24 25 26 27The system provides the following inter-process communication (IPC) mechanism: 28 29 30[Common Events](../basic-services/common-event/common-event-overview.md): This mechanism is used in one-to-many communication scenarios. Multiple subscribers may receive events at the same time. 31 32 <!--no_check-->
