1# Account<a name="EN-US_TOPIC_0000001078092678"></a> 2 3## Introduction<a name="section11660541593"></a> 4 5In a standard system, the Account subsystem supports login status management of distributed cloud accounts, interconnection with vendors' cloud account apps on the device side, and query and update of the cloud account login status. 6 7## Architecture<a name="section1412183212132"></a> 8 9**Figure 1** Account subsystem architecture<a name="fig4460722185514"></a> 10 11 12 13 14## Directory Structure<a name="section161941989596"></a> 15 16``` 17/base/account 18└── os_account # OS account module 19 ├── common # Common basic code 20 ├── interfaces # APIs exposed externally 21 ├── kits # Development framework 22 ├── sa_profile # SA profile 23 ├── services # Service code 24 └── test # Test code 25 └── resource # Test resources 26``` 27 28## Usage Guidelines<a name="section1312121216216"></a> 29 30Using the available classes for managing distributed accounts, you can query and update the account login status, including login, logout, unregistration, and token expiration. 31 32To query and update the login status of a distributed account, you must obtain the required system permission. These APIs are supported only by system apps. 33 34## Repositories Involved<a name="section1371113476307"></a> 35 36**Account subsystem** 37 38account\_os\_account 39 40
