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Lesson 2: Offering Remote Assistance 511 Enabling Remote Assistance 511 Requesting Remote Assistance 512 Offering Unsolicited Remote Assistance 515 Establishing the Remote Assistance Session 516 Windows Remote Assistance Compatibility Issues 518 Practice: Offering Remote Assistance 519 Lesson Summary 521 Lesson Review 521 Review 523 Summary 523 Key Terms 523 Case Scenarios 524 Case Scenario 1: Configuring Remote Desktop 524 Case Scenario 2: Offering Remote Assistance 524 Suggested Practices 524 Enable Remote Desktop Remotely 525 Offer Unsolicited Remote Assistance 525 Accept a Remote Assistance Request from a Friend 525 Take a Practice Test 525 Answers 527 Glossary 565 Index 569.

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You can t make changes to a field in a form if the form is protected. If you need to make changes to a protected form, click the Protect Form button on the Forms toolbar to remove protection. For more information on creating and working with forms, see Creating a Basic Form on page 876.

Field shading can help you show users where to enter their responses in a form you ve created. If you want to make field entries stand out, you can add a background shade that calls a reader s eye to a field on your form. To add a shade to a field, follow these steps:

Dim rwl As New ReaderWriterLock() Dim rnd As New Random() Sub TestReaderWriterLock() For i As Integer = 0 To 9 Dim t As New Thread(AddressOf DoTheTask9) t.Name = i.ToString t.Start() Next End Sub

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1 Open the document in which you ve created your form and unprotect it, if necessary, 2 Click Tools, Options. The Options dialog box appears. 3 Click the View tab. In the Show section, click the Field Shading arrow to display your

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Sub DoTheTask9() Dim tname As String = Thread.CurrentThread.Name() Perform 10 read or write operations. (Reads are more frequent.) For i As Integer = 1 To 10 If rnd.NextDouble < 0.8 Then Attempt a read operation. rwl.AcquireReaderLock(Timeout.Infinite) Console.WriteLine( Thread {0} is reading", tname) Thread.Sleep(300) Console.WriteLine( Thread {0} completed the read operation", tname) rwl.ReleaseReaderLock() Else Attempt a write operation. rwl.AcquireWriterLock(Timeout.Infinite) Console.WriteLine( Thread {0} is writing", tname) Thread.Sleep(300) Console.WriteLine( Thread {0} completed the write operation", tname) rwl.ReleaseWriterLock() End If Next End Sub

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Figure 31-7. You can have Word add shading to field entries to highlight dataentry fields for users.

If you run this code, you ll see that multiple threads can be reading at the same time and that a writing thread blocks all the other threads. The AcquireReaderLock and AcquireWriterLock methods can take a timeout argument, expressed as a number of milliseconds or a TimeSpan value. You can test whether the lock was acquired successfully by means of the IsReaderLockHeld or IsWriterLockHeld read-only property if you passed a value other than Timeout.Infinite:

Note Field shading will appear only in those documents you use online or in electronic form. When you print the form, the shading will not appear.

You can create a nested field, which is a field within a field, to provide multiple levels of variable information. You can create a nested field by following these steps:

Attempt to acquire a reader lock for no longer than 1 second. rwl.AcquireWriterLock(1000) If rwl.IsWriterLockHeld Then The thread has a writer lock on the resource. End If

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2 Click OK to close the Field dialog box and add the field to your document. 3 Press Alt+F9 to display field codes if necessary, and then place the insertion point

A thread that owns a reader lock can also attempt to upgrade to a writer lock by calling the UpgradeToWriterLock method and later go back to the reader lock by calling DowngradeFromWriterLock.

If you make changes to fields as you work, either by changing the arguments or by modifying the data on which the fields are based, you need to have a way to update the fields to reflect these changes. To update the fields in your document, choose one of these methods:

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To update a single field, click in the field and press F9. To update multiple fields, select them by pressing Ctrl and clicking the fields, then

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