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Programmers like wizards because they get to treat users like peripheral devices Each of the wizard s dialogs asks users a question or two, and in the end the application performs whatever task was requested They are a fine example of interrogation tactics on the program s part, and violate the design principle: Provide choices, don t ask questions (see 10) Wizards are written as step-by-step procedures, rather than as informed conversations between user and program The user is like the conductor of a robot orchestra, swinging the baton to set the tempo but otherwise having no influence on the proceedings In this way, wizards rapidly devolve into exercises in confirmation messaging The user learns that he merely clicks the Next button on each screen without critically analyzing why The worst thing about wizards is that they often still ask obscure questions.

Figure 3.1 Hosts on the Ethernet network communicate with each other using the Ethernet protocol, and hosts on the ATM network communicate using the ATM protocol. A router is required for hosts using different Layer 2 protocols to communicate with each other.

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A user who doesn t know what an IP address is in a normal dialog will be equally mystified by it in a wizard A better way to create a wizard is to make a simple, automatic function that asks no questions of users but that just goes off and does the job If it creates a presentation, for example, it should create it, and then let the user have the option, later, using standard tools, to change the presentation The interrogation tactics of the typical wizard are not friendly, reassuring, or particularly helpful The wizard often doesn t explain what is going on Wizards were purportedly designed to improve user interfaces, but they are, in many cases, having the opposite effect They are giving programmers license to put raw implementation model interfaces on complex features with the bland assurance that: We ll make it easy with a wizard.

This separation of the differing networks by a router (Layer 3 device) provides many key features that might not be immediately obvious. First, any message from an Ethernet station to another Ethernet station is insulated from the ATM network. This means that no ATM station will ever have to concern itself with understanding an Ethernet frame. More than this, it means that the router will drop any packets that arrive at its Ethernet interface that are not intended for a device on the ATM network and vice versa. This means that a device can have assurance that it will not receive packets from an unrecognized Data Link protocol and it will not have to waste valuable processing time on extraneous data. Another benefit is that each device needs to have a protocol stack only for its respective network. ATM devices need only an ATM protocol stack, and Ethernet devices need only an Ethernet stack. They may all have identical IP protocol stacks, and, indeed, this is probably the case if they are all running the same operating system (most OSs embed the TCP/IP protocol stack as part of the system itself). Finally,

For channel annotations, the compiler ensures that the propagation of data items in the deployed network is in accordance with the declarative intent of the channel annotations If data items are routed, in the ATaG program, to tasks that are mapped onto specific, hard-coded node IDS, then the compiler generates specific instructions for the runtimes on the producer nodes to transmit the data item to the specific node ID Correctnessdoes not imply anyhng more than the above translation ATaG, like almost all the programming languages, only provides building blocks with well-defined syntax and semantics to the programmer The programmer is solely responsible for translating the high-level application functionality (such as track an elephant ) into the sequence of communication and computation that must take place in the network to accomplish the objective By providing high-level abstractions to concisely specify this communication.

the separation provides protection in the event of a serious network malfunction on either network. The router will prevent errors relating to the Ethernet protocol from infecting the ATM network and vice versa. All hosts on the Ethernet network could be encountering serious problems, and the ATM hosts could still continue communicating with each other without any problems. This sort of network separation is a key part of good network design, and you will encounter it frequently.

This is all too reminiscent of the standard abdication of responsibility to users: We ll be sure to document it in the manual..

In the following sections, we examine some of the most important Layer 2 protocols. The protocols in this section comprise all of the most important Data Link protocols in use in modern networks with the exception of Ethernet. Because of its particular importance, we discuss Ethernet in its own separate section later in the chapter.

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