用户在登录系统时，判断用户的权限，根据用户的权限登录到不同的页面。
This system judges user's right when logging in and then directs the users to corresponding pages.
在登录系统(如oracle)之后，启动sqlplus，然后执行下列步骤(请参见清单9)。
After logging on to the systems as Oracle, start up sqlplus and then just follow the steps as instructed (see Listing 9).
您希望了解用户的“轨迹”，从最初登录到在系统上执行的每个操作。
You want to see the trail that the user followed, from initial login to every action performed on the system.
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