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irb gives you the results of methods and expressions immediately. This makes it an ideal tool for debugging or putting together quick snippets of code, and for testing concepts.
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All Windows Vista editions support Remote Assistance, and by default all Windows Vista installations allow Remote Assistance connections with proper authentication. Business, Ultimate, and Enterprise editions support incoming Remote Desktop connections as well, a powerful option that allows you to log on to any Windows Vista system from across a network. By default, Remote Desktop connections are disabled. To change these settings, open System in Control Panel, click Remote Settings, and adjust the options shown under the Remote Desktop heading. In Figure 2-17 on the next page, for example, we ve allowed incoming connections only from computers where users log on using Network Level Authentication in Windows Vista.
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The Categories column in Calendar view appears below the appointment area.
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Figure 6-13 Both area relationships and area brightness control perception
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signature is invalid, and BitLocker will lock out the recovery password as well as routine key protectors. This scenario will only occur if the attacker has physical possession of the volume or computer. If you regain possession of the volume, you will need to use the BitLocker Repair Tool and a backup copy of the FVEK, as well as the recovery password. Therefore, you should ensure that these items are backed up using the AD DS system or the WMI provider. Also keep in mind that BitLocker is an optional feature on Windows Server 2008. Because the encryption and decryption operations are implemented in a filter driver, you cannot use BitLocker until you install the feature, as described earlier in this chapter. Note, however, that installing or removing BitLocker requires restarting the server. BitLocker does not support clusters. If you configure servers in failover clusters, you cannot use BitLocker to protect shared volumes. BitLocker like all encryption products and technologies incurs a performance hit. In most user scenarios, this performance is not noticeable, and can be measured at well less than 5 percent. However, if your server is performing intensive disk operations or is very heavily loaded, you may need to take this into consideration in capacity planning. Security is often a matter of trade-offs. One significant trade-off to make with regards to BitLocker is whether to require user intervention at start-up. By default, BitLocker operates using the TPM as a key protector and, providing that the integrity validation completes successfully, BitLocker will unlock the Windows operating system volume without user intervention. However, this means that a thief who takes the entire server can also turn it on without any interference from BitLocker. To mitigate this risk, use the TPM with a PIN, with a USB Flash Drive (called a startup key), or both. This increases security tremendously, but it also means that a server cannot automatically restart. (Leaving a start-up key in the server all the time would be a foolish idea.) Because servers are normally running this may not be a problem until a power failure results in the branch being down because the one manager who had the PIN is on vacation. My recommendation, in most cases, is to use a TPM plus PIN, but to ensure that there is an operational procedure that describes who knows the PIN, how to use it, and how to obtain the PIN from central support if needed. This also requires that any planned restarts (such as for an operating system upgrade or update) are scheduled when someone with the PIN is on-site. Only your organization can make the call about which is the more important risk: potential additional downtime or potential theft of the server.
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inevitably makes the associated application techniques much more complicated . On the contrary, there are examples (not too many, admittedly) that provide convincing evidence that even highly complex systems can very simply and systematically be made easy to grasp and to use . And I m not just thinking of software .
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If you choose to send an e-mail, Task Scheduler will require the address of your outbound (SMTP) server. If you opt for a message, the dialog box will provide fields for the window title and message text. The Send An E-Mail and Display A Message options are not available for tasks set to run on Windows XP, Windows 2000, or Windows Server 2003.
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there are multiple mechanisms is to keep threads running as long as possible and to reduce overhead as much as possible . I don t want to get into all of the details here, but suffice it to say that Microsoft has done a lot of work to reduce the overhead involved with a garbage collection . Microsoft will continue to modify these mechanisms over time to ensure efficient garbage collections in the future . When the CLR wants to start a garbage collection, it immediately suspends all threads that are executing managed code . The CLR then examines each thread s instruction pointer to determine where the thread is executing . The instruction pointer address is then compared with the JIT compiler produced tables in an effort to determine what code the thread is executing . If the thread s instruction pointer is at an offset identified by a table, the thread is said to have reached a safe point . A safe point is a place where it s OK to leave a thread suspended until a garbage collection completes . If the thread s instruction pointer isn t at an offset identified by an internal method table, the thread isn t at a safe point, and the CLR can t perform a garbage collection . In this case, the CLR hijacks the thread: the CLR modifies the thread s stack so that the return address points to a special function implemented inside the CLR . The thread is then resumed . When the currently executing method returns, the special function will execute, suspending the thread . However, the thread might not return from its method for quite some time . So after the thread resumes execution, the CLR waits about 250 milliseconds for the thread to be hijacked . After this time, the CLR suspends the thread again and checks its instruction pointer . If the thread has reached a safe point, the garbage collection can start . If the thread still hasn t reached a safe point, the CLR checks to see whether another method has been called; if one has, the CLR modifies the stack again so that the thread is hijacked when it returns from the most recently executing method . Then the CLR resumes the thread and waits another few milliseconds before trying again . When all of the threads have reached a safe point or have been hijacked, garbage collection can begin . When the garbage collection is completed, all threads are resumed, and the application continues running . The hijacked threads return to the method that originally called them . This algorithm has one small twist . When the CLR wants to start a garbage collection, it suspends all threads that are executing managed code, but it does not suspend threads that are executing unmanaged code . Once all of the threads that are executing managed code are at a safe point or are hijacked, the garbage collection is allowed to start . The threads executing unmanaged code are allowed to continue running because any object that they are using should have been pinned . If a thread currently executing unmanaged code returns to managed code, the thread is immediately suspended until the garbage collection has completed . As it turns out, the CLR uses hijacking most of the time rather than using the JIT compiler produced tables to determine if the thread is at a safe point . The reason is the JIT compiler
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Determining Your Needs Choosing an Internet Connection Choosing a Network Type Choosing Network Devices Choosing Server Hardware Choosing Client Hardware and Software Choosing a Domain Name for the Network Naming Computers Ensuring Physical Security Securing Client Computers Securing Wireless Networks Securing Internet Firewalls
The second method uses the STBoundary() method to convert the Area1 polygon boundary into a LineString . The STDistance() method is then used to find all points within .4 units of the LineString:
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classroom (0.0.2) classx (0.0.6) classx-pluggable (0.0.1) classy-inheritance (0.6.2) giraffesoft-classy_resources (0.3.0) johnsbrn-classy-inheritance (0.6.8) loe-iclassify-interface (1.0.0) magic_metaclass (1.0.0) shuber-eigenclass (1.0.1) unageanu-javaclass (0.2.1) yury-classifier (1.3.3) In this case, you would have asked the repository for all gems with names including the word class.
A try block contains code that requires common cleanup or exception recovery operations. The cleanup code should be placed in a single finally block. A try block can also contain code that might potentially throw an exception. The exception recovery code should be placed in one or more catch blocks. You create one catch block for each kind of event you think the application can recover from. A try block must be associated with at least one catch or finally block; it makes no sense to have a try block that stands by itself.
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