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Back in the days of command lines and character-based menus, interfaces indirectly offered services to users. If you wanted to change an item, such as your address, first you explicitly had to ask the application permission to change it. The application would then display a screen where your address could be changed. Asking permission is pure excise, and unfortunately things haven t changed much if you want to change one of your saved addresses on Amazon.com, you have to click a button and go to a different page. If you want to change a displayed value, you should be able to change it right there. You shouldn t have to ask permission or go to a different room.

however, despite the failure of the actual OSI protocols, the OSI Reference Model terminology lives on and is widely used to describe the layering of network protocols Indeed, much networking terminology derives from the OSI protocol suite A very few remnants of OSI are still in use; for example, Lightweight Directory Access Protocol (LDAP), which is a derivation and simplification of X500, and Intermediate System to Intermediate System (IS-IS), which was designed as an OSI routing protocol IS-IS was later adapted to TCP/IP networks and is still a key routing protocol in many provider networks, while LDAP is used in some networks to provide user authentication services The following list maps the TCP/IP suite layers to the OSI model to see how they fit and where they differ.

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As in the last example, many applications have one place where the values (such as filenames, numeric values, and selected options) are displayed for output and another place where user input to them is accepted. This follows the implementation model, which treats input and output as different processes. A user s mental model, however, doesn t recognize a difference. He thinks, There is the number. I ll just click on it and enter a new value. If the application can t accommodate this impulse, it is needlessly inserting excise into the interface. If options are modifiable by a user, he should be able to do so right where the application displays them.

The TCP/IP suite differs from the OSI model in that the TCP/IP suite uses four protocol layers and the OSI model uses seven layers Figure 115 shows the rough protocol layer relationship between the two models It is rough because some of the functions of the TCP/IP layers bleed into the functions of the other OSI layers This is not the fault of the TCP designers as after all, they were first to the party and their primary concerns were to design a practical protocol and not a protocol that fits neatly into the OSI model Network Interfaces The network interfaces layer defines the interface between hosts and network devices and contains the functionality of both the physical and data link layers of the OSI model.

The opposite of asking permission can be useful in certain circumstances. Rather than asking the application to launch a dialog, a user tells a dialog to go away and not come back again. In this way, a user can make an unhelpful dialog box stop badgering him, even though the application mistakenly thinks it is helping. Microsoft now makes heavy use of this idiom. (If a beginner inadvertently dismisses a dialog box and can t figure out how to get it back, he may benefit from another easy-toidentify safety-net idiom in a prominent place: a Help menu item saying, Bring back all dismissed dialogs, for example.)

The processing of a put 0 call is more involved. Figure 3.24 shows the flow of control among DART components triggered by a put 0. Steps 1 through 7 of the figure correspond to the following:

Protocols such as Ethernet describe both the framing of data (Layer 2) and the physical transmission of the frame over the media (Layer 1) This layer is often referred to as Layer 2 or L2 because it provides OSI Layer 2 type services to the IP layer Internet Protocol The IP layer provides a universal and consistent forwarding service across a TCP/IP network IP provides services comparable to the OSI network layer and is sometimes referred to as a Layer 3 (or L3) protocol The OSI protocol CLNP corresponds most closely to IP Transport The transport layer comprises two main protocols, TCP and UDP These transport protocols provide similar services to the OSI transport protocols TCP is very similar to the OSI transport protocol, TP4 TCP and UDP may be referred to as Layer 4 protocols..

You should be vigilant in finding and rooting out each small item of excise in your interface. These myriad little extra unnecessary steps can add up to a lot of extra work for users. This list should help you spot excise transgressions:

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