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Users can become confused and frustrated when they are forced to apply trial and error to learn and use a system that presents many things but then often just replies with an error message. Every operation needs to check permissions. This may cause complexity, duplicated code or if omitted lack of security. The user interface design becomes bloated when a system is serving disparate user roles. If you show everything to everybody, regardless of their interest in the system, it is very hard to find your way through the task. Too many features either remain hidden in deeply-nested menus or dialogs, or clutter available screen space.

CHECK POINT (287) and SECURITY SESSION (297) can be used to implement FULL ACCESS WITH ERRORS (305).

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Designing the user interface for a system in which different users are granted different access rights can be challenging. This pattern guides a developer in presenting only the currently-available functions to a user, while hiding everything for which they lack permission.

For a trendline to represent resistance, it simply has to be above the prices. It doesn t matter if the stock is going up or down (although resis-

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Now that you know where all the main controls are located, it s time to charge the battery and get the camera ready to make some cool images. The Canon G11 comes with a 7.4 V NB-7L Battery Pack and Battery Charger CB-2LZ. The battery ships with only a very low charge and must be charged before using the camera for the rst time. Although quite pricey for a proprietary camera battery (about $55), I opted for an additional battery at the time of purchase knowing I would eventually run out of battery power at the most inopportune moment. It s always good insurance to have a spare battery along for any electronic component.

Extending the Web site example from FULL ACCESS WITH ERRORS (305): registered users are able to upload files to your Web site. After uploading they also need a means of deleting or changing the uploaded files. However, an individual user should only be able to change their own files. Only a user with administrative rights should be allowed to maintain files by all users. Yahoo! groups provides a similar means of uploading files to groups for its group members. However, only the uploading member is able to delete or edit the file. The group owner can delete files uploaded by all users. If no permission is given, one can see the File menu, corresponding to FULL ACCESS WITH ERRORS (305), but the file folder itself cannot be extended by adding files.

You are designing the user interface of a system in which access restrictions such as user authorization apply to parts of the interface. While most of the applications of this pattern are within the domain of graphical user interfaces (GUIs), it can also apply to other interface types as well.

tance during a downtrend is more useful from a chartist s perspective). So long as the prices are trapped underneath the trendline, that trendline represents resistance, meaning that buyers do not have the strength to push it above the line. Figure 7.24 offers a superb example of resistance with a downtrending market. This is the USD/CAD (that is, the foreign exchange market of the U.S. Dollar and Canadian Dollar pair). At the beginning of the graph, a Canadian dollar was worth about $1.58 in U.S. dollars. The downtrend shown here was in place for years, erasing over a third of Canadian purchasing power versus the U.S. Again and again, the prices made a move toward the resistance level, sometimes getting close to crossing it, but they failed each time. This graph represents a staggering loss in currency value, and a person short this position would have enjoyed steadily mounting pro ts, knowing to get out only when the trend was broken. A trader positioned in a security can use trendlines for just such a purpose that is, as long as the price is on the correct side of the line, I m fine. Imagine having a short position in Express Scripts (ESRX) during the time shown in Figure 7.25. Suppose you shorted the stock on March

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