A few minutes later he started a null session with the remote NT box, and a few minutes after that he had a nice list of user IDs to play with.
几分钟后，他在远程NT主机上启动了一个空会话，又过了几分钟，他得到了用户的ID列表。
Line 7 gets the session key from the session if it's already present, else it would be null.
如果会话已存在，第7行代码将从会话中获取会话键，否则它将为null。
The session parameter can be null, meaning that the method will create a separate anonymous session, do the work and then save the session in one method call.
session参数可以为空，这表示该方法将创建一个单独的匿名会话，请创建该会话，然后在一次方法调用中保存它。
If instances in your implementation ever get passivated, the inventory Iterator will be null — or worse, have some undefined value from another session!
如果在您的实现中不对实例进行钝化，那么“inventory”Iterator将为空，或者更糟，具有来自另一个对话的未定义的值。
When you work with strings with a null value, the result of the concatenation depends on the session Settings.
处理具有空值的字符串时，串联结果取决于会话设置。
Returns the object bound with the specified name in this session, or null if no object is bound under the name.
返回session中指定名称的绑定对象，如果没有对象被绑定，返回null。
Returns the object bound with the specified name in this session, or null if no object is bound under the name.
返回session中指定名称的绑定对象，如果没有对象被绑定，返回null。
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