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When you have a field that can contain a long data string (for example, the Notes field in the tbReservationRequests table), it s a good idea to provide a scroll bar in the control to make it easy to scan through all the data. This scroll bar appears whenever you select the control. If you don t add a scroll bar, you must use the arrow keys to move up and down through the data. To add a scroll bar, first open the form in Design view. Select the control, and open its property sheet. Then set the Scroll Bars property to Vertical. For example, if you open the frmXmplReservationRequests form in Form view and tab to (or click in) the Notes text box, the vertical scroll bar appears, as shown in Figure 12-22.

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Special identities Entities built into Windows Server 2003 and other Windows oper ating systems, such as Everyone and Authenticated Users, that function like groups, but which you cannot modify by adding or deleting members. Group Policy Object A collection of configuration settings and other features that you associate with specific Active Directory container objects, such as domains, sites, and organizational units. All the objects in the container receive the settings specified in the GPO. Account policies Specific elements of a Group Policy Object that you use to imple ment features such as password restrictions and account lockout behavior.

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If you specify both an Input Mask property setting (see 4, Creating Your Database and Tables ) and a Format property setting, Access uses the Input Mask setting to display data when you move the focus to the control and uses the Format setting when the control does not have the focus. If you don t include a Format setting but do include an Input Mask setting, Access formats the data using the Input Mask setting. Be careful not to define a Format setting that conflicts with the Input Mask. For example, if you define an Input Mask setting for a phone number that looks like

You should always be aware of how your application consumes the limited resources on the phone, such as bandwidth, memory, and battery power. These factors are far more significant on the phone than on the desktop.

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You might not want users of your form to select or update certain controls. You can set these conditions with the control s Enabled and Locked properties. For example, if you use a control to display an AutoNumber field, you can be certain that Access will provide the field s value. So it s a good idea to set the control s Enabled property to No (so that the user can t select it) and the control s Locked property to Yes (so that the user can t update it). Table 12-7 shows the effects of the Enabled and Locked property settings. Note, however, that if you want the user to be able to use the Access built-in Find facility to search for a particular AutoNumber value, you should leave Enabled set to Yes to allow the user to select the field and find values in it.

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Table 12-7.

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Control can have the focus. Data is displayed normally and can be copied or searched but not changed. Control cannot have the focus. Control and data appear dimmed. Control can have the focus. Data is displayed normally and can be copied and changed. Control cannot have the focus. Data is displayed normally but can t be copied or changed.

In some cases, you might want to allow a control to be selected with the mouse but to be skipped over as the user tabs through the controls on the form. You can set the control s Tab Stop property to No while leaving its Enabled property set to Yes. This might be useful for controls for which you also set the Locked property to Yes. Setting the Tab Stop property to No keeps the user from tabbing into the control, but the user can still select the control with the mouse to use the Find command or to copy the data in the control to the Clipboard.

1. What is the primary reason for using workstation operating systems based on Windows NT on a network, rather than operating systems based on DOS

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