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Access to resources requires proper identification and proper permissions. There is no additional configuration to be done to access files across a network than to make sure that the resource is accessible (shared) and that the user has appropriate permissions to accomplish the desired action (read, write, delete, and so on). This transactional process of analyzing the user s access token involves reading the entries on the access control list (ACL) of the resource, and comparing the list with the security identifiers (SIDs) on the token. If the security services governing the resource access process determine that the combination of SIDs and their permissions is sufficient to perform the requested task, permission and access is granted; if not, access to the resource is denied. Such permission-based access is accomplished by the operating system based upon the file system that is installed on the storage device where the resource resides. On a FAT32 file system, for example, even if the operating system version is Windows Server 2003, permissions cannot be set at the file system level: NTFS permissions are required for this type of permission assignment. Share permissions, however, can be set regardless of the file system on which the resources are stored. The operating system alone controls the share permissions, which are valid for any entity attempting to access the resource from across the network. Terminal Services provides a different type of access to resources, in that it presents a local environment to the user over the network. The creation and use of this virtual local environment requires additional permissions and configuration, but the resource access to files and folders is still governed by network (share) and file system (NTFS) permissions. The understanding of these additional configuration needs and possibili ties is key to the proper use of Terminal Services.

IPv4 is responsible for ensuring that a packet sent across an IPv4 network reaches its destination. DHCP automatically Configures computers on a network with their IPv4 configurations. DNS resolves a host name or FQDN to an IP address. An IPv4 address identifies a computer (or other network device) on a subnet. A subnet mask defines the range of IP addresses on a subnet. A wired small network that contains more than one computer typically implements Transmission Control Protocol/Internet Protocol (TCP/IP) configuration through ICS. Computers and other devices on a wireless or hybrid small network obtain their configurations from the WAP. You use the Network And Sharing Center to view computers and devices on a network, connect to a network, set up a connection or network, and manage network connections. You can also use the Netsh interface ipv4 command to manage IPv4 networks. You can access the Windows Network Diagnostics tool from the Network And Sharing Center to troubleshoot a faulty network connection. If you fail to connect to a Web site, you can access the same tool by clicking Diagnose Connection Problems. You can use the Ping, Tracert, and Pathping commands to troubleshoot network connectivity. The Netstat command returns network protocol statistics.

As mentioned earlier in this chapter, UAC is a common source of compatibility issues because applications designed for previous versions of Windows might not receive the access they require to run. ACT includes a tool, primarily intended for application developers, that tests for these issues, much in the same way that the Internet Explorer Compatibility Test Tools examine Web-based applications. The Standard User Analyzer, using a wizard-based or manual format, executes an application you select, and as you access the application s various functions, the analyzer displays its activities in real time, as shown in Figure 9-13, and stores them in a log.

Moving Disks Between Servers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16

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Building Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

7. Back in the form designer, click the phoneNumberTextBox and then open the Property Sheet. Click the Events button to display a list of the events for the control. Double-click the Validating event to create the phoneNumberTextBox_Validating event handler. 8. Add code to the event handler to ensure that the Text property on phoneNumberTextBox contains only numbers and dashes. If it doesn t, the change of focus will be canc e l e d . A d d t h e fo l l ow i n g c o d e t o t h e Va l i d a t i n g e ve n t h a n d l e r fo r t h e phoneNumberTextBox: