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This practice is a good exception to the rule of not using endline comments; they are exceptionally useful in documenting input and output parameters. This occasion for commenting is also a good illustration of the value of using standard indentation rather than endline indentation for routine parameter lists; you wouldn t have room for meaningful endline comments if you used endline indentation. The comments in the example are strained for space even with standard indentation. This example also demonstrates that comments aren t the only form of documentation. If your variable names are good enough, you might be able to skip commenting them. Finally, the need to document input and output variables is a good reason to avoid global data. Where do you document it Presumably, you document the globals in the monster prolog. That makes for more work and unfortunately in practice usually means that the global data doesn t get documented. That s too bad because global data needs to be documented at least as much as anything else.

Figure 14.4 Exporting a registry file. 4. In the Export range area of the dialog box, click Selected branch. 5. In the Save in list box, choose a location to which to save your backup registry file. Typically, the My Documents folder is the default, and that works fine.

When you deploy a DNS server on a domain controller, you can choose to store the zone data in the Active Directory database. Active Directory integrated zones minimize zone transfer traffic, improve security, decrease administrative overhead, and improve fault tolerance. Zone data can be configured to be replicated among all DNS servers in the Active Directory forest, among all DNS servers in the Active Directory domain, among all domain controllers in the Active Directory domain, or among all servers enlisted in a custom application directory partition. When a DNS zone allows dynamic updates, certain DNS client computers can reg ister and update their resource records with a DNS server. When secure dynamic updates are required in the zone, only the owner of the record can update the record. Secure dynamic updates can be required only on Active Directory integrated zones. Client computers running Windows 2000, Windows XP, and Win dows Server 2003 can perform dynamic updates. The DnsUpdateProxy group is typically used for DHCP servers performing dynamic DNS updates on behalf of other computers. Members of this group do not record ownership on the resource records they register in DNS. This behavior restriction prevents problems from arising in zones that allow only secure dynamic updates. The Start Of Authority (SOA) tab allows you to configure the zone s SOA resource record and several parameters that affect zone transfers, such as Refresh Interval, Retry Interval, Expires After, and Minimum (Default) TTL. The Zone Transfers tab allows you to control transfers from the current zone. By default, zone transfers are either completely disabled or limited to servers speci fied on the Name Servers tab. The nature of this restriction depends on the zone type and the manner in which the DNS server has been installed.

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To immediately update Group Policy and request a computer certificate,

or module by using the Web.config file. To which configuration element do you add your handler or module

24

Important The CLR performs arithmetic operations on 32 bit and 64 bit values only So, b and 200 are first converted to 32 bit values and then added together The result is a 32 bit value that must be cast to a Byte before the result can be stored back in the variable b C# doesn t perform this cast for you implicitly, which is why the Byte cast on the second line of the preceding code is required In most programming scenarios, this silent overflow is undesirable and if not detected causes the application to behave in strange and unusual ways In some rare programming scenarios (such as calculating a hash value or a checksum), however, this overflow is not only acceptable but is also desired Different languages handle overflows in different ways.

Clicking the name of a module will display the configuration screen for it. In the case of many modules, the configuration screen offers more than the standard details settings. As you can see in Figure 5-24, the Banners module has almost a dozen specialized parameters (shown in the Parameters frame) that apply specifically to it.

C and C++ don t consider overflows to be an error and allow the value to wrap; the application continues running with its fingers crossed Visual Basic, on the other hand, always considers overflows as errors and throws an exception when it detects an overflow The CLR offers IL instructions that allow the compiler to choose the desired behavior The CLR has an instruction called add that adds two values together The add instruction performs no overflow checking The CLR also has an instruction called addovf that also adds two values together However, addovf throws a SystemOverflowException exception if an overflow occurs In addition to these two IL instructions for the add operation, the CLR also has similar IL instructions for subtraction (sub/subovf), multiplication (mul/mulovf), and data conversions (conv/convovf) C# allows the programmer to decide how overflows should be handled.