# > Application object
以下是 `application` API 的使用方法。
### 应用集
应用集对象包含以下属性。
|属性 类|说明|<|
|---------------------|------|-|
|applicationid|string|*(readonly)* 应用集的 ID。|
|**hostid**
(required)|string|应用集所属主机的 ID。
不能进行更新。|
|**name**
(required)|string|应用集名称。|
|flags|integer|*(readonly)* 应用集的来源。
可能的值为：
0 - 普通应用集；
4 - 自动发现的应用集。|
|templateids|array|*(readonly)* 上级模板应用集的 ID。|
The following objects are directly related to the `application` API.
### Application
The application object has the following properties.
|Property|Type|Description|
|--------|----|-----------|
|applicationid|string|*(readonly)* ID of the application.|
|**hostid**
(required)|string|ID of the host that the application belongs to.
Cannot be updated.|
|**name**
(required)|string|Name of the application|
|flags|integer|*(readonly)* Origin of the application.
Possible values:
0 - a plain application;
4 - a discovered application.|
|templateids|array|*(readonly)* IDs of the parent template applications.|