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Figure 12-32. Add common series resistor Finally, Figure 12-33 shows heat shrink covering the connections.

For example, for this priority an error could occur when the user asks a program to open a nonexistent file IsDebugEnabled { get; } IsInfoEnabled { get; } IsWarnEnabled { get; } IsErrorEnabled { get; } IsFatalEnabled { get; }.

By using ls al on this directory, you can see the appropriate permissions for files Apple already has there..

The immense popularity of Apache is due in part to the large number of modules that have been developed for it. However, when used improperly, these modules can represent a security risk. To reduce the risk associated with running a web server, all modules not required should be disabled by placing a # in front of the LoadModule section of the line. To learn which modules are required, look to the manual pages at Apache.org to get a better idea of what they are, or simply disable them one by one to see which modules will break the site if disabled. The modules that load in your httpd.conf file include any that begin with LoadModule and do not have a # in front of the line. One example of a module that can be easily disabled without impacting the performance of the web server is bonjour_module, a module used to allow your web server to be discovered through Bonjour. Because most users will be visiting your site using a browser, it is not important for the server to work with Bonjour. To disable bonjour_module, place # at the beginning of the LoadModule so the full line reads as follows: #LoadModule bonjour_module libexec/apache2/mod_bonjour.so

Probably the most common means of serializing a class in NET is through binary serialization, as it s used for files and remoting Binary serialization is unique in that the footprint of the object s data in memory is almost identical to the footprint of the data in the other medium To illustrate how the Serialization pattern is implemented for binary serialization, consider the following class declaration: [Serializable] class SampleClass { private int _value; private string _buffer; public SampleClass(int value, string buffer) { _value = value; _buffer = buffer; } public int Value { get { return _value; } } public string Buffer { get { return _buffer; } } } SampleClass has been marked serializable because of the [Serializable] attribute This means when doing binary serialization, all data members of SampleClass will be serialized regardless of the scope of the data member.

Figure 12-33. Heat shrink to insulate connections Assuming that executives make important decisions that are about as good as flipping a coin, you can make a contraption that makes yes/no decisions at the push of a button (see Figure 12-34). You make the yes/no indicator using the circuit shown in Figure 12-28, with one red and one green LED.

It may become necessary to bind a Mac to Active Directory using the Active Directory plug-in from the command line. Perhaps you need to force the binding, you want to use a setting not available in the GUI, or you want to use the Active Directory plug-in in a server script. For times like these, you will find the command dsconfigad to be handy. dsconfigad does not require root privileges to run and can be used from the command line to force certain aspects of directory services to work even when the GUI will not bind clients as needed. These include the following: -enableSSO enables Kerberos authentication for services, such as AFP, by generating Kerberos principals (commonly used with the magic triangle, described in the next section). -ggid maps group ID information. -mobile automates the enabling of mobile accounts. -preferred enables the use of a preferred server.