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In addition to the challenges developers face in managing connectivity and limited device resources, the fact that mobile device technologies are reasonably new and continually evolving makes technology choices more difficult. Although most server technologies are stable, the Windows Phone 7 is brand new and at the time of this writing many of the interoperability components and technologies are still under development or available only as preview versions.

11

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Figure 8-2 Windows Server 2003 and Windows 2000 Server versions Table 8-1

Microsoft Office Access 2003 Inside Out Finally, switch to Form view and choose Size to Fit Form from the Window menu. Your form should look something like the one shown in Figure 11-28. The form now looks a bit more customized and somewhat more like the frmProducts form in the LawTrack Contacts application. You can find this form saved as fxmplProducts1 in the sample database.

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Windows Server 2003, Web Edition Windows Server 2003, Standard Edition 133 MHz Up to 4 128 MB 4 GB Domain controller or member server Windows Server 2003, Enterprise Edition 133 MHz Up to 8 128 MB 32 GB Domain controller or member server Windows Server 2003, Datacenter Edition 400 MHz From 8 to 64 512 MB 64 GB Domain controller or member server

Figure 11-28.

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One drawback to working with a relational database is that often you have to deal with information stored in multiple tables. That s not a problem if you re using a query to link data, but working with multiple tables can be confusing if you re entering new data. Microsoft Access provides some great ways to show information from related tables, thus making data input much simpler.

There are more viable alternatives to Windows operating systems for servers than for workstations. Novell NetWare, now in version 6.0, is a server operating system that is comparable to Windows Server 2003 in many ways, including support for TCP/IP pro tocols and services, and an enterprise directory service called Novell eDirectory. There

In 10, Using Forms, you saw how you can use a combo box or a list box to present a list of potential values for a control. To create the list, you can type the values in the Row Source property box of the control. You can also specify a table or a query as the source of the values in the list. Access displays the currently selected value in the text box portion of the combo box or as a highlighted selection in the list. The CategoryDescription field in tblProducts is a simple text data type. To help ensure data consistency, there s a separate lookup table that contains a list of predefined product types. There s also a referential-integrity rule that keeps you from entering anything other than a predefined type in the CategoryDescription field. However, you can type anything you like in the CategoryDescription text box (labeled Product Type) that the Form Wizard designed. Go ahead and type any random string of characters in the text box and then try to save the record. You should see an unfriendly technobabble message about related record is required in tlkpProductCategory . You can help avoid this problem by providing a combo box to edit and display the CategoryDescription field instead. The combo box can display the list of valid values from table tlkpProductCategory to make it easy for your user to choose a valid value. The combo box can 426

Building a Form also limit what the user enters to only values in the list. In 23, Automating Your Application with Visual Basic, you ll learn how to write Visual Basic code to detect when a user tries to enter something that s not in the list so that you can provide your own, more user-friendly, message. To see how a combo box works, you can replace the CategoryDescription text box control with a combo box on the Products form. In Design view, select the CategoryDescription text box control and then press the Delete key to remove the text box control from the form (this also removes the related label control). Be sure the Control Wizards button is selected in the toolbox, and then click the Combo Box button in the toolbox and drag the CategoryDescription field from the field list to the form. The new control appears on the form, and Access starts the Combo Box Wizard, as shown in Figure 11-29, to help you out.

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Figure 11-29.

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