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Technical support A system administrator or help desk operator can use Remote Assistance to connect to a remote computer to modify configuration parameters, install new software, or troubleshoot user problems. Troubleshooting By connecting in read-only mode, an expert can observe a remote user s activities and determine whether improper procedures are the source of problems the user is experiencing. The expert can also connect in interactive mode to try to recreate the problem or to modify system settings to resolve it. This is far more efficient than trying to give instructions to inexperienced users over the telephone.

Private Sub Worksheet_Change(ByVal Target As Excel.Range) ActiveWorkbook.ActiveSheet.Tab.ColorIndex = 5 End Sub

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For more information on Excel events in general, and what does or does not trigger the Worksheet_Change event in particular, see 12, Understanding and Using Events.

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[ActionName("Edit"), AcceptVerbs(HttpVerbs.Post)] public ActionResult EditViaPost(string listCustomers) { string customerId = listCustomers; return RedirectToAction("Edit", new RouteValueDictionary(new { id = customerId })); }

Training Trainers and help desk personnel can demonstrate procedures to users right on their systems, without having to travel to their locations.

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Formatting Excel Objects Figure 10-1 shows two worksheets with sheet tabs that were changed using the Worksheet_Change event procedure. The worksheet on the left is active, so Excel displays a line of the tab s color below the worksheet name, but notice that Excel displays the worksheet s name in black type on a white background so that the name can be read easily. The inactive sheet to the right displays the tab with a full blue background and black text, indicating it was also changed.

To receive remote assistance, the computer running Windows Server 2003 or Windows XP must be configured to use the Remote Assistance feature in one of the following ways:

Figure 10-1. The active sheet s name is displayed with a view to readability, whereas inactive sheet tabs let the tab s color take precedence.

Using Control Panel Display the System Properties dialog box from the Control Panel and click the Remote tab. Then select the Turn On Remote Assistance And Allow Invitations To Be Sent From This Computer check box (see Figure 13-9).

You need to be sure to put the code for a worksheet event, such as Worksheet_Change, in the code module associated with the worksheet you want to monitor.

If the user types the URL directly in the address bar, the selected customer is edited and the view and URL are in full sync. If the user picks up a customer from the drop-down list and then posts to edit it, a redirection occurs and the Edit action receives an HTTP GET request. The PRG pattern is helpful in keeping the URL and view in sync, but it s even more useful for keeping update code and the view neatly separated, as you ll see in a moment. In this regard, the PRG pattern saves you from the nasty F5 problem (page refresh requests from

By clicking the Advanced button in the Remote tab in the System Properties dialog box, the user can specify whether to let the expert take control of the computer or simply view activities on the computer. The user can also specify the amount of time that the invitation for remote assistance remains valid.

When you program Excel using VBA, it can be easy to forget that the most important part of your worksheet is the data. The easier your data is to understand, the more effective your pre sentation will be. Figure 10-2 on page 234 offers a somewhat extreme example of the differ ence between a well-formatted worksheet and a worksheet with no distinction between headings and data. Most Excel users learn how to use the controls on the Formatting toolbar and in the Format Cells dialog box very early in their Excel careers. In a similar vein, you should make the Font object part of your basic VBA repertoire. Table 10-6 lists and describes the properties of the Font object.

Using Group Policies Use the Group Policy Object Editor console to open a GPO for an Active Directory domain or organizational unit object containing the client computer. Browse to the Computer Configuration\Administrative Tem plates\System\Remote Assistance container and enable the Solicited Remote Assistance policy (see Figure 13-10).

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