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5.5 Operating System Access Control Patterns by this pattern, which provides a view of the maximum functionality of the system, but issues the user with an error when they attempt to use a function for which they are not authorized.

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.

We present architectural patterns for access control in operating systems. We assume here that resources are represented as objects, as is common in modern operating systems. The figure on page 72 shows how these patterns relate to each other. For example, authentication is needed for file access and for controlled object access, a subject must be authorized to access an object in a specific way, and we need to make sure that the requestor is not an impostor. The other three patterns, CONTROLLED OBJECT FACTORY (331), CONTROLLED OBJECT MONITOR (335), and CONTROLLED PROCESS CREATOR (328), complete the definition of the CONTROLLED EXECUTION ENVIRONMENT (346) pattern, where the creation of and access to objects are controlled. The diagram also shows that the CONTROLLED OBJECT MONITOR (335), the CONTROLLED EXECUTION ENVIRONMENT (346), and the FILE AUTHORIZATION (350) patterns are concrete examples of the REFERENCE MONITOR (256) of 8. Requirements for the AUTHENTICATOR (323) pattern can be found in 7.

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where you can choose either View By Symbol or View By Company Name By default, View By Company Name is chosen (and therefore a check mark is next to it) By far the most useful feature in My Watch Lists is the ability to dragand-drop items between lists This lets you control the content of the lists so that your trading world can stay organized For example, assume you had three watch lists set up One was named Candidates Long (which had stocks you were seriously considering buying), another was named Current Long Positions (which had the stocks you actually owned), and another was named Stocks I Follow (which was everything else, neither owned nor being considered for purchase) Being able to drag-and-drop between these lists is clearly valuable, since what belongs in these lists changes over time.

In Single Shot mode, one image is captured with each press of the Shutter button. Switching to Continuous shooting mode gives you the maximum frames to catch quick action. The actual number of frames you can capture depends on the timing of the action, shooting mode, shutter speed, focusing mode, and the space remaining on the memory cards and the type of cards you re using. The G11 is equipped to handle the latest SDHC cards, which can signi cantly raise writing speed.

This pattern addresses the problem of how to verify that a subject is who it says it is. Use a SINGLE ACCESS POINT (279) to receive the interactions of a subject with the system and apply a protocol to verify the identity of the subject.

5

This pattern addresses how to specify the rights of processes with respect to a new object. When a process creates a new object through a factory (see FACTORY METHOD and ABSTRACT FACTORY [GoF95]), the request includes the features of the new object. These features include a list of rights to access the object.

If Apple Computer (symbol AAPL) was in your Stocks I Follow list, and you were seriously considering buying it, you would drag it to the Candidates Long list Later, if and when you actually bought some of this stock, you would drag it to the Current Long Positions list The mechanics of dragging and dropping will be addressed in this chapter, since it applies to other modules as well Another helpful feature in My Watch Lists, as well as in most other modules, is the arrows that appear at the bottom of the module There is a pair of up-arrows and a pair of down-arrows on the left and right, and a single up-arrow and down-arrow in the middle, as shown in Figure 38.

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