JDO使用PersistenceManager管理事务，而实体bean将事务管理委派给了ejb容器。
JDO USES the PersistenceManager to manage the transactions, whereas entity beans delegate transaction management to the EJB container.
图5按照WebSphere Portal提供的存取控制说明了委派的管理模型。
Figure 5 illustrates the delegated administration model as provided by WebSphere Portal access control.
新的租户无论什么时候请求虚拟门户，服务提供者创建了另一个实例并且将新虚拟门户的管理委派给租户的管理员。
Whenever a new tenant requests a virtual portal, the service provider creates another instance and delegate the administration of the new virtual portal to the tenant's administrator.
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