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Although you can install only one security manager, you can write the security manager so that it establishes multiple security policies. In addition to the "check" methods, the security manager also has methods that allow you to determine if a request is being made either directly or indirectly from a class loaded by a class loader object, and if so, by which class loader object. This enables you to implement a security policy that varies depending on which class loader loaded the classes making the request. You can also vary the security policy based on information about the class files loaded by the class loader, such as whether or not the class files were downloaded across a network or imported from the local disk. So even though an application can have only one security manager, that security manager can establish a flexible security policy that varies based on the trustworthiness of the code requesting the potentially unsafe action.