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Tip The Solicited Remote Assistance policy also enables you to specify the degree of con trol the expert receives over the client computer, the duration of the invitation, and the method for sending e-mail invitations. The Offer Remote Assistance policy enables you to specify the names of users or groups that can function as experts, and whether those experts can perform tasks or just observe.

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the client). If the user refreshes the currently displayed page (that is, he hits the F5 button) after an update, no POST is repeated and no message pops up to announce your intent to resend data. In fact, when F5 is pressed the browser repeats its latest action. When using PRG, the browser repeats a GET action, not a POST action, when from the user s perspective, their last action was a POST.

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Table 10-6.

To receive remote assistance, a client must issue an invitation and send it to a particular expert. The client can send the invitation using e-mail, Microsoft Windows Messenger, or can save it as a file to be sent to the expert in some other manner, using the interface shown in Figure 13-11.

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The Background property, which is only used for text on charts, can take one of three Excel constants: xlBackgroundAutomatic (which defaults to the chart element s setting), xlBackgroundOpaque (which makes the text box s background appear over other chart elements), or xlBackgroundTransparent (which lets other chart element colors show through). Set to True or False, this property determines whether the font will be displayed in bold type. Uses the RGB property to return or set the font s color. Returns or sets a font color to a color in the Excel color palette. Contains a string that is used to return or set the font style (for example, Bold Italic or Regular ). The available styles differ depending on the font. Set to True or False, this property determines whether the text will be displayed in italics. Contains a string that is used to return or set the name of the font in which the text is displayed. Returns or sets the size of the font, in points. Set to True or False, this property determines whether the text will have a horizontal line through the middle of the text. Set to True or False, this property determines whether the text will be formatted as subscript. Set to True or False, this property determines whether the text will be formatted as superscript. Returns or sets the type of underlining for the selected text. The style of underlining is represented by one of these Excel constants: xlUnderlineStyleNone, xlUnderlineStyleSingle, xlUnderlineStyleDouble, xlUnderlineStyleSingleAccounting, or xlUnderlineStyleDoubleAccounting.

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After the input form is displayed, the user enters any valid data and then presses the button that posts the current content of the form. Here s a typical form that posts changes:

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The MsgBox function returns an integer value that indicates which button was clicked by the user. These values are listed in Table 4-10.

Tip When users create invitations, they can specify a password that the expert has to supply to connect to their computers. You should urge your users to always require passwords for Remote Assistance connections, and instruct them to supply the expert with the correct password using a different medium from the one they are using to send the invitation.

Table 4-9.

Once the expert receives the invitation, invoking it launches the Remote Assistance application, which enables the expert to connect to the remote computer, as shown in Figure 13-12. Using this interface, the user and the expert can talk or type messages to each other and, by default, the expert can see everything that the user is doing on the computer. If the client computer is configured to allow remote control, the expert can also click the Take Control button and operate the client computer interactively.

0 1 2 3 4 5 16 32 48 64

Because an expert offering remote assistance to another user can perform virtually any activity on the remote computer that the local user can, this feature can be a significant security hazard. An unauthorized user who takes control of a computer using Remote Assistance can cause almost unlimited damage. However, Remote Assistance is designed to minimize the dangers. Some of the protective features of Remote Assistance are as follows:

<% Html.BeginForm("Update", "Customer", new {id = ViewData.Model.CustomerID}); %> ... <% Html.EndForm() %>

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