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A directory service provides the means to organize and simplify access to resources of a networked computer system. Users and administrators might not know the exact name of the objects they need. However, they might know one or more characteristics of the objects in question. As illustrated in Figure 1-1, they can use a directory service to query the directory for a list of objects that match known characteristics. For exam ple, Find all color printers on the third floor queries the directory for all color printer objects that are associated with the third floor characteristic (or maybe a location char acteristic that has been set to third floor ). A directory service makes it possible to find an object based on one or more of its characteristics.

Table 15-2.

Directory server Name: Server 1 OS: Windows 2000 Type: File server Location: 1st floor Name: Server 2 OS: Novell NetWare 4.0 Type: File server Location: 2nd floor Printer Name: Printer 1 Type HP-4Si Color: No Duplex: Yes Location: 3rd floor

Prevents the line from being displayed on the screen when used as the first character in a line. Turns screen echoing off or on. Displays msg on the screen.

{ public void Method1(string s) { Console.WriteLine("Class2.Method1"); } } class Class3 { public void Method1(object o) { Console.WriteLine("Class3.Method1"); } } class Class4 { public void Method1(int i) { Console.WriteLine("Class4.Method1"); } } static class Extensions { static public void Method1(this object o, int i) { Console.WriteLine("Extensions.Method1"); } static void Main() { new Class1().Method1(12); new Class2().Method1(12); new Class3().Method1(12); new Class4().Method1(12); } }

A directory service is both an administration tool and an end user tool. As a network becomes larger, more objects must be managed and the directory service becomes a necessity.

15

Active Directory is the directory service included in the Windows Server 2003 family. Active Directory includes the directory, which stores information about network resources, as well as all the services that make the information available and useful. Active Directory is also the directory service included in Windows 2000.

Table 15-2.

1

Displays a blank line on the screen. Identifies msg as a comment. Executes cmd if the error level value returned from the previous command is greater than or equal to num. (Not reverses the logic.) Executes cmd if file exists. (Not reverses the logic.) Executes cmd if txt1 is the same as txt2, including case. (Not reverses the logic.) Transfers control to the line marked by label. Names the line to be reached by a Goto command.

This code produces the following results:

Active Directory in the Windows Server 2003 family is a significant enhancement over the flat domain model provided in Windows NT. Active Directory is integrated within the Windows Server 2003 family and offers the following features:

For %%var In (set) Do [cmd] Loops through the items in set, executing cmd for each loop %%var and replacing any instances of var with the matching item from set, which can be a list separated by spaces or can contain the wildcard characters * and . Shift Call batfile args Setlocal Shifts command-line parameters one place so that %2 becomes %1, %3 becomes %2, and so on. Executes batfile with args and then returns to the calling batch program. Makes current environment variables local to this batch program; any changes to variables are known only in this batch program until Endlocal is executed. Makes environment variables known to the system; any changes made after Endlocal remain in effect when the batch program terminates. Saves the current folder on a stack and changes to path. Changes to the last folder saved by Pushd and removes it from the stack. Suspends processing until a key is pressed. Sets the title of the Command Prompt window.