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Presenting all potentially-available functionality to users not privileged to use it can represent a security problem. You might want users that don t have access to a functionality to not even be aware that it exists. A system utilized by people with varying skills and access rights can be very hard to use if every possible option is presented to every user, as is proposed by FULL ACCESS WITH ERRORS (305). It is much more user friendly if a user can only see or select the options actually available. How can you present a system s functionality and ensure that users can only access those parts or data of a system to which they are entitled The solution to this problem must resolve the following forces:

Users should not be able to see or activate operations they cannot perform. Users should not view data for which they have no permissions. Users do not like being told what they cannot do and become annoyed by access violation messages. Input validation can be easier when you limit users to see and operate only what they can access. If options pop in and out dynamically because of changes to access rights or roles, users can become confused and the GUI s usability decreases.

Opinions vary about camera battery memory, but all agree it is a good idea to fully exhaust your camera s battery so that when you recharge it, the battery gets a complete charge. Under normal conditions, recharging from the beginning takes about 2 1/2 hours.

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Only let users see what they have access to. In a GUI, show them only the selections and menus that their current access privileges permit. For example, if a user is not allowed to edit some data, do not present an edit button and use a read-only field to show that data. When a user starts the system an I&A mechanism authenticates them and associates a SECURITY SESSION (297), typically within a CHECK POINT (287) architecture. The SECURITY SESSION (297) object caches the current privileges of the user that can then be used by the GUI implementation to decide what functions and data are permissible and may be presented to the user, independently of the function s implementation. In contrast to checking the access rights of a user after a request is issued, as would be done

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FIGURE 7.24 The Canadian dollar s long slide versus the U.S. dollar is shown here, with the resisting trendline never being overcome.

in FULL ACCESS WITH ERRORS (305), the system checks the access rights before presenting the user interface. Only functionality that is available to the user is rendered by the interface builder. Details of GUI implementation are beyond the scope of this pattern, but patterns such as NULL OBJECT can be used to represent unavailable items or disable active GUI elements. The same mechanism that is used for hiding non-available GUI elements can be used to disable GUI elements, depending on the application s state. For example, if no document has been opened by a text editor, there is no active save the document button only buttons to open an existing document or create a new one might be available in that state of the application. If the user lacks the permission to create new documents, even the latter might be missing.

In contrast to FULL ACCESS WITH ERRORS (305), the interface is responsible for checking a user s access rights, even before the user interface is presented to the user. The protected system itself does not in general need to check rights, but may still rely on access rights for additional responsibilities such as logging and so on.

If you want to change the language setting of your G11 camera, you have 26 choices. To set the language, follow these steps: 1. Press the Playback button. The next step may be a little tricky to get right. 2. Press and hold the Function/Set button, then immediately press the Menu button to display the language list. 3. Use the Control dial to select the correct language and then press the Function/Set button. As often as you ll ever do this, use both thumbs to press the buttons at the same time. I eventually managed to do this with just my right thumb, but it took a bit of practice.

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