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On the SwitchboardSample form, I created buttons to open Companies, Contacts, Products, Pending Events, and Invoices. I also created buttons to open pages to show code lists that can be edited and the available reports. On the Code Lists page, I added entries to open Contact Types, Event Types, Product Categories, Person Titles, Person Suffixes, and Users. I also added a button to return to the main menu. On the Reports Page, I added entries to open Company Reports, Contact Reports, and Product Reports as well as a button to return to the main menu. After you finish, the Switchboard Manager saves the main switchboard form with the name Switchboard. You can rename this form if you want to. If you want to rename the Switchboard Items table, be sure to edit the Visual Basic procedures stored with the Switchboard form so that they refer to the new name. You ll also need to change the record source of the form. Figure 24-24 shows an example Switchboard form for the LawTrack Contacts database (the SwitchboardSample form). I edited the form design to add the LawTrack logo. You can further customize the look of this form as long as you don t remove any of the option buttons or attached labels or change the names of these controls.

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When designing systems for a single user, the developer doesn t need to worry about how changes that one person makes affect other users. In actuality, it is rare for a production system to be used by only one user, as they typically grow and take on lives of their own. As the system grows to support multiple users, we need to take into account the conflicts that arise when two users try to change the same record at the same time. In general, there are two strategies to handle this: pessimistic concurrency, which locks a second user out of changing a record until the first user has released a lock, and optimistic concurrency, which allows two users to make changes. In the case of optimistic concurrency, the application designer needs to decide whether to retain the first user s values, retain the last update, or somehow merge the values from both users. Each strategy offers different advantages and disadvantages.

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Prior to .NET, many applications maintained open connections to the database. With these systems, developers frequently wrote applications that would retrieve a record in the database and retain a lock on that record to prevent other users from making changes to it at the same time. This kind of locking is called pessimistic concurrency. Small Windows-based applications built with this pessimistic concurrency worked with few issues. However, as those systems needed to scale to larger user bases, the locking mechanisms caused systems to bog down.

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Microsoft Office Access 2003 Inside Out I personally prefer to design my own switchboard forms so that I can add specialized code behind some of the command buttons. But you can see that this wizard is a handy way to quickly design a complex set of switchboard pages without a lot of work.

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Especially if you re distributing your application for others to use, you probably want your application to automatically start when the user opens your database. As noted in the previous section, you should design switchboard forms to help the user navigate to the various parts of your application. You should also set properties and write code to ensure that your user can cleanly exit your application.

The object manager creates the namespace root directory (\), \ObjectTypes directory, and the DOS device name mapping directory (\Global ) It then creates the \DosDevices symbolic link that points at the Windows subsystem device name mapping directory 10 The executive is called to create the executive object types, including semaphore, mutex, event, and timer 11 The I/O manager is called to create the I/O manager object types, including device, driver, controller, adapter, and file objects 12 The kernel debugger library finalizes initialization of debugging settings and parameters if the debugger has not been triggered prior to this point 13 The transaction manager also creates its object types, such as the enlistment, resource manager, and transaction manager types 14 The kernel initializes scheduler (dispatcher) data structures and the system service dispatch table 15.

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