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Host controller Also known as the root, the root tier, or the root hub, the host controller can be built into the motherboard of the computer or installed as an add-in CardBus or PCI card in the computer to gain additional ports and bandwidth. The host controller controls all traffic on the bus and also functions as a hub. Hub Provides multiple ports, for attaching devices to the USB bus. Hubs are also responsible for detecting devices that are plugged in or unplugged, and for providing power for attached devices. Hubs are either bus-powered, drawing power directly from the USB bus, or self-powered, drawing power from an external AC adapter. Bus-powered hubs are capable of providing 100 milliamperes (mA) of power per port for attached devices, and they can provide a maximum of four ports for devices to be plugged into. Self-powered hubs, on the other hand, typically provide 500 mA of power per port, and they can provide more than four ports. Hubs can be stand-alone devices, or they can be integrated into other devices such as keyboards and monitors. Device A USB device, which is attached to the bus through a port. A USB device can be any kind of peripheral device, such as a keyboard, mouse, game controller, printer, and so forth. Certain USB input devices such as keyboards and mice require only 100 mA of power to function. Thus, they can be plugged into both bus-powered and self-powered hubs, in addition to being plugged directly into a root port. Other devices such as print-

Part II:

Understanding Network Resource Access Sharing Resources Sharing Printers Sharing Files Configuring NTFS Permissions 398 400 400 419

ers, scanners, storage devices, and video-conferencing cameras might require 500 mA of power to function. These kinds of devices can only be plugged into root ports or selfpowered hubs. If the device requires more than 500 mA of power, it includes a wall plug provided by the vendor for power.

private void UpdateListBox() { List<KeyValuePair<string, string>> Locations = new List<KeyValuePair<string, string>>(); MSNWeatherData myMSNWeather = new MSNWeatherData(); Locations = myMSNWeather.GetLocations(txtCurrentCity.Text); lbPossibleCities.DataSource = Locations; lbPossibleCities.DisplayMember = Value ; lbPossibleCities.ValueMember = Key ; }

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A USB device typically implements a single function, as a keyboard or mouse does. However, a USB device can also implement multiple functions, such as scanning, printing, and faxing. When such a multifunction device, or USB composite device, is plugged in, the operating system enumerates all the functions in the device and loads device drivers for each function. A USB device might also include a built-in hub to enable additional devices to be plugged into it. Such a device is known as a USB compound device. Each USB device contains configuration information that describes its capabilities and resource requirements. This information is read from the device by the operating system during the enumeration process. USB devices are recognized, initialized, and ready for use when plugged in. No additional installation or configuration steps are necessary. Windows XP Professional features built-in support for USB device types, including integrated USB 2.0 support beginning with SP1, such as:

Why bother using networks at all This is a fundamental question to ask before embarking on any network design. The usual answer is that a network is desired for the sharing of information. Without a network, your only option to move files from computer to computer is with a removable disk, and you can t share other hardware resources such as printers. Although this observation might appear to be obvious, sharing resources continues to be the primary reason for creating home and small office networks. In addition, the need to share an Internet connection is often reason enough to create a network. In Microsoft Windows domain-based networks, centralized control, management, and security also continue to be major reasons for networking. But to users working on small or large networks, access to resources is the most important aspect of the network. The term network share refers to a resource on the network that is designated to be shared among some or all the network s users. The most common shared network object is usually a folder or hard disk, but network shares can be many types of resources, such as disks, folders, removable storage devices, and printers. This chapter examines the process of sharing network resources, which consists of creating network shares, assigning share permissions, assigning file system permissions (if the NTFS file system is used), and managing shared resources. Common sharing problems and their solutions are also discussed in this chapter.

Hubs Uninterruptible power supply (UPS) devices Input devices, such as keyboards, mice, and other pointing devices Game controllers, such as joysticks and game pads Printers Storage devices, such as hard disk drives, CD-ROM drives, high-density disk drives, and compact flash readers Speakers and microphones Scanners Still image cameras Video-conferencing cameras (also known as webcam cameras) Modems USB-to-Ethernet network adapters

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