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If a programmer uses the standard modeless dialog box facility in the Windows API, the resultant dialog is visually indistinguishable from a modal one. We must break this habit. The designer must assure that all modeless dialog boxes are rendered with a clearly noticeable visual difference. Possible methods include using a different background, making the controls visually distinct, or using a different color title bar or icon. Whatever method you choose, you must consistently stick with it. The second principle says that we must adopt consistent and correct conventions for the terminating commands. It seems that each vendor, sometimes each programmer, uses a different technique on each individual dialog box. There isn t any reason for this cacophony of methods. Some dialogs say Close, some say Apply, some use Done, while others use Dismiss, Accept, Yes, and even OK. The variety is endless. Still others dispense with terminating buttons altogether and rely only upon the Close box in the title bar. Terminating a modeless dialog box should be a simple, easy, consistent idiom, very similar if not exactly the same from program to program.

The ISO is a network of national standards institutes based in Geneva, Switzerland. Its goal is to help promulgate standards that have been developed by consensus in particular fields of industry. The OSI model is simply one of many computer industry standards developed by the ISO, which, in turn, is simply one field of the many that have ISOdeveloped standards.

Figure 11-3 Here is a horrible confirmation box that stops the proceedings with idiocy. If the application is smart enough to detect the difference, why can t it correct the problem itself The options the dialog offers are scary. It is telling you that you can explode one of two boxes: one contains garbage, and the other contains the family dog but the application won t say which is which. And if you click Cancel, what does that mean Will it still go ahead and explode your dog

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The OSI model is represented by the seven layers depicted in Figure 1.14. These layers may be grouped into two main areas, defined simply as the upper and lower layers. Although a single device (e.g., a UNIX workstation) can execute all seven layers, this is not practical in real networks. The amount of traffic that needs to be moved through modern networks requires purpose-built devices that handle various layer functions. Two such examples are bridges, which are purpose-built for Layer 2 operation; and routers, which are purpose-built for Layer 3 operations.

This dialog is asking you to make an irreversible and potentially costly decision based on no information whatsoever! If the dialog occurs just after you changed some rules, doesn t it stand to reason that you want to keep them And if you don t, wouldn t you like a bit more information, like exactly what rules are in conflict and which of them are the more recently created You also don t have a clear idea what happens when you click Cancel. . . . Are you canceling the dialog and leaving the rules mismatched Are you discarding recent changes that led to the mismatch The kind of fear and uncertainty that this poorly designed interaction arouses in users is completely unnecessary. We discuss how to improve this kind of situation in 24.

OSI Application Presentation Session Transport Network Lower layers Data link Physical Upper layers

the data pool and, as a side effect, can change the state of a particular instance of a data item from available to unavailable, etc. In the current implementation, the processing of a get 0 call is performed entirely within the Datapool component, and none of the services offered by other DART components are used by Datapool.

It is important to understand at the outset that the OSI model is simply that a model. There are various protocols that implement services at each of the described layers of the model, but the model itself is simply a reference point for protocol designers. The OSI reference model was developed at the end of the 1970s, but the development of actual protocols to support the reference model was slow. (Recall that TCP had been developed in 1973 and thus predates the OSI model.) By the early 1990s, several OSI protocols (TP0-4, CLNS, CONS, X.400, and X.500) had been specified and commercial implementations attempted, but the success of TCP/IP and the weaknesses of OSI led to the complete adoption of TCP/IP for internetworking. OSI protocols were never in wide use, and today they are more of interest for historical ideas that didn t really catch on, like the Edsel or New Coke.

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