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Visual grouping of normally-available features versus those requiring authorization can be helpful 3 Design error notification for the user In simple cases this often allows the user to register or authenticate themselves, such as with Yahoo groups In more complex settings with finer-grained access rights management, it might give a process description of how to obtain the corresponding access right At the other end of the spectrum, an unauthorized access can be simply ignored An additional means of security is to audit users, especially for unauthorized access This can provide hints on potential for misuse, or on the lack of access rights for a given user role 4 Provide access rights checks for system components Before the execution of each system function, a user s right to do so must be checked.

A combination of CHECK POINT (287) and SECURITY SESSION (297) provide a means of implementing the place where this checking is performed Further details about how to ensure that such checks are carried out is beyond the scope of this pattern, but, for example, a COMMAND PROCESSOR [POSA1] can check access rights for issued commands centrally Integrate checks and error notification mechanisms with the system..

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Laptop computer or portable storage device. Backing up images on-site either to a laptop or to a handheld hard drive is an essential part of the work ow throughout the day. Unless I have to, I won t delete images from the memory cards after loading them onto the computer or handheld device so that I have two copies of the images at all times. For vacation, travel, and landscape work, some additional items to consider include: Cell phone and/or location device. If you re hiking in mountain areas, check in with the ranger station to see if it has GPS location devices or electronic signal devices you can borrow that will enable rescuers to more easily nd you in case of an emergency. Your cell phone may also have a GPS system installed. Passport, driver s license, or other identi cation. If you re staying in a hotel, be sure to carry the hotel s phone number or business card with you. Notebook and pen. Write down your impressions of the area, especially rst impressions that can help you de ne your creative inspiration of the place and, subsequently, your approach to shooting. You can also add lighting setups (if any), shooting settings, date and time, and so on. A small video clip could also be shot to complement your notes.

Following FULL ACCESS WITH ERRORS (305), the Web site initially contains all possibly available links. The download links are only available for registered users, so they point to a CGI script that first checks whether the user has registered already by checking whether the corresponding cookie is set in the request. In this case the Web site can also deal with bookmarks, links pointing to protected material issued by unauthenticated or unauthorized users.

FIGURE 7.20 This chart of the Dow 30 shows the long term trendline and the medium term trendline, the latter showing an increase in upward momentum.

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LIMITED ACCESS (312) demonstrates the opposite strategy to FULL ACCESS WITH ERRORS (305) by presenting the user only the permitted functionality, thus avoiding surprising error messages. In many concrete cases neither of the extremes shown by these two patterns are used, but concrete designs lie somewhere in the middle. However, it is difficult to define somewhere in the middle. As a starting point, you should chose a pattern according to the more visible forces in your context, and adapt it to suit the application domain. A middle ground between FULL ACCESS WITH ERRORS (305) and LIMITED ACCESS (312) is to show all an application s features, but to gray out menu items or buttons not available in the current situation. This allows a user to see what is available, but still provides instant feedback on what is really usable at the moment. Often this approach combines best of both worlds, as long as there aren t too many features to clutter the UI.

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