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Windows Update is a stand-alone tool instead of a webpage. Windows Update will immediately connect to an update server the first time Windows Vista connects to a network. Windows Update automatically installs drivers for devices that are using generic drivers or that do not have any driver installed. Administrators can configure Windows Update to automatically install recommended updates as well as critical updates. Now non-administrators can approve update installations without providing administrative credentials. Windows Update can wake a computer from sleep to install updates, so users no longer need to leave their computers running to enable updates to be installed overnight.

The thread pool is created the first time you invoke the ThreadPool.QueueUserWorkItem method or when a timer or a registered wait operation queues a callback operation. The pool has a default limit of 25 active threads; each thread uses the default stack size and runs at the default priority. The thread pool is available in all Windows versions. You can borrow a thread from the pool by using the ThreadPool.QueueUserWorkItem method, which requires a WaitCallback delegate and an optional object that holds the data you want to pass to the thread. The WaitCallback delegate must point to a Sub procedure that receives one Object argument (whose value is either the optional object passed to the QueueUserWorkItem method or Nothing). The following code shows how you can use a large number of threads to call an instance method of a class:

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The Protect Form button is an important option on the Forms toolbar. Before you can see the form in the way the user will see it, you must protect the form. When you protect a form, you lock the fields in place so that no further changes can be made to field formats or specifications. Of course, you ll still be able to use the lists as intended, select check boxes, and enter text in text fields. To protect a form, click the Protect Form button; to unprotect a form, click the Protect Form button again. When a form is protected, the fields appear as the user will see them. When the form is unprotected, you see only the field name or the sample data you ve entered for the field.

For i As Integer = 1 To 20 Create a new object for the next lightweight task. Dim task As New LightweightTask() Pass additional information to it. (Not used in this demo.)

You might want to assign a password to a form so that you can control when and if a form is unprotected. To protect a form in this way, follow these steps:

This lesson describes the different techniques for deploying updates to Windows Vista computers and explains how to install and manage updates and how to troubleshoot update problems.

top of the tab enables you to set two different kinds of passwords one to open the document, and another to modify it.

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Figure 31-10. You can use the Security tab of the Options dialog box to assign a password to the form.

After this lesson, you will be able to: n Choose a deployment technique for distributing updates within your organization. n Install updates automatically, manually, and to new computers. n Troubleshoot problems installing updates. n Uninstall updates. Estimated lesson time: 30 minutes

task.SomeData = other data" Run the task with a thread from the pool. (Pass the counter as an argument.) ThreadPool.QueueUserWorkItem(AddressOf task.DoTheTask, i) Next

3 In the password box of your choice, type a password of up to 15 characters. 4 Click OK. Word displays a Confirm Password dialog box so that you can reenter the

If you want to modify a password-protected form at a later time, you can use your password to enable editing. When you open the file, a dialog box appears asking for your password. Type the password and click OK, and the form will appear as shown below.

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