| 摘要 |
When monitoring a large number of information sources such as pages on the World Wide Web, a user may not have time to normally look at each source at regular intervals. A background process will connect to each source maintained in a database and calculate an estimate of how much the source has changed since the last time a user viewed it. The amount of change is graphically displayed to the user as part of an icon or file listing. The user can thus determine whether the amount of new material justifies connecting to the source.
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