The object can generate process instance specific data, such as process name, current activity, current logged in user, and the current instance ID.
该对象能生成进程实例特定数据，比如进程名称、当前活动、当前登录用户以及当前实例 ID。
With PEAR installed, the script can query the current messages, fetch each row, and output the user name and the comment text.
PEAR安装后，脚本可以查询当前的消息，检索每一行，输出用户名和消息文本。
If the user does not specify the user name and password with a job, the user's current credential is automatically persisted as a security token in the job database.
如果用户不随作业指定用户名和密码，则用户的当前凭据自动作为安全令牌保留在作业数据库中。
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