打印机管理 (Wrok with Writer) 打印机激活 (Start Printer Writer) 打印机终止 (End Writer)
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考虑到打印机管理通常由根用户管理，因此更明智的做法是修改根用户的本地. profile文件，而不是影响到所有用户。
Considering the administration of printers is typically managed by the root user, it is wiser to modify root's local.profile file rather than affecting all users.
例如，可能存在有关授权哪些用户使用或管理哪些打印机的规则。
For example, there could be rules about which users are authorized to use or manage which printers.
我们可以使用标准的J2EE基于角色的安全性来管理打印机访问。
We could potentially use standard J2EE role-based security to manage printer access.
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