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Software should not simply remember these kinds of explicit facts, but should also remember useful information that can be deduced from these facts. For example, if the application remembers the number of bytes changed in the file each time it is opened, it can help the user with some reasonableness checks. Imagine that the changed-byte-count for a file was 126, 94, 43, 74, 81, 70, 110, and 92. If the user calls up the file and changes 100 bytes, nothing would be out of the ordinary. But if the number of changed bytes suddenly shoots up to 5000, the application might suspect that something is amiss. Although there is a chance that the user has inadvertently done something about which he will be sorry, the probability of that is low, so it isn t right to bother him with a confirmation dialog. It is, however, very reasonable for the application to make sure to keep a milestone copy of the file before the 5000 bytes were changed, just in case. The application probably won t need to keep it beyond the next time the user accesses that file, because the user will likely spot any mistake that glaring immediately, and he would then demand an undo.

As already discussed, OSPF is based on routers exchanging link state information with each other. Two OSPF routers must create an OSPF neighbor adjacency before they can exchange routing information. On point-to-point OSPF networks, neighboring routers automatically become fully adjacent with each other once they detect each other via OSPF Hello updates. For example, in Figure 9.2, r2 becomes fully adjacent

Most applications discard their stack of undo actions when the user closes the document or the application. This is very shortsighted on the application s part. Instead, the application could write the undo stack to a file. When the user reopens

with both r1 and r3. All neighbor adjacencies in the point-to-point network are indicated with the arrows in the figure.

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the file, the application could reload its undo stack with the actions the user performed the last time the application was run even if that was a week ago!

Figure 9.2 In order to exchange link state information with each other, neighboring OSPF routers must build an adjacency. OSPF routers that are connected to each other on point-to-point links always form adjacencies. The adjacency process begins once each router sees its own router ID in the Hello packets from the other router. Once routers become adjacent, they exchange full link state tables with each other.

An application with a better memory can reduce the number of errors users make. This is simply because users have to enter less information. More of it will be entered automatically from the application s memory. In an invoicing application, for example, if the software enters the date, department number, and other standard fields from memory, the invoicing clerk has fewer opportunities to make typing errors in these fields. If the application remembers what the user enters and uses that information for future reasonableness checks, the application can work to keep erroneous data from being entered. Contemporary Web browsers such as Internet Explorer and Firefox provide this facility: Named data entry fields remember what has been entered into them before, and allow users to pick those values from a combo box. For security-minded individuals, this feature can be turned off, but for the rest of us, it saves time and prevents errors.

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Applications might also leave a small thread running between invocations. This little application can keep an eye on the files it worked on. It can track where they go and who reads and writes to them. This information might be helpful to a user when he next runs the application. When he tries to open a particular file, the application can help him find it, even if it has been moved. The application can keep the user informed about what other functions were performed on his file, such as whether or not it was printed or faxed to someone. Sure, this information might not be needed, but the computer can easily spare the time, and it s only bits that have to be thrown away, after all.

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A remarkable thing happens to the software design process when developers accept the power of task coherence. Designers find that their thinking takes on a whole new quality. The normally unquestioned recourse of popping up a dialog box gets replaced with a more studied process, where the designer asks questions of much greater subtlety. Questions like: How much should the application remember Which aspects should be remembered Should the application remember more than just the last setting What constitutes a change in pattern Designers start to imagine situations like this: The user accepts the same date format 50 times in a row, and then manually enters a different format once. The next time the user

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