Single-User single task 单用户单工作操作系统 ; 单用户单任务操作系统
The default value is 1 meaning, that only a single user should/can process the task.
缺省值为1，这意味着，只有1个用户应该/可以处理这个任务。
The single CSLD task thread services all jobs in a sequential way and connects to one user mailbox after the other to extract the mails.
一个 CSLD 任务线程按顺序为所有任务服务，并且逐个地连接到各个用户邮箱，以便提取邮件。
A use case is a single task, performed by the end user of a system, that has some useful outcome.
用例是单个任务，能产生有用的结果，由系统最终用户执行。
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