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than the collision detection standard used in wired Ethernet Here s the difference Wireless nodes listen in on the wireless medium to see if another node is currently broadcasting data If so, it waits a random amount of time before retrying So far, this method is exactly the same as the method used by wired Ethernet networks Because wireless nodes have a more difficult time detecting data collisions, however, they offer the option of using the Request to Send/Clear to Send (RTS/CTS) protocol When enabled, a transmitting node that determines that the wireless medium is clear to use sends an RTS frame to the receiving node The receiving node responds with a CTS frame, telling the sending node that it s okay to transmit Then, once the data is sent, the transmitting node waits for an acknowledgment (ACK) from the receiving node before sending the next data packet Very elegant, but keep in mind that using RTS/CTS introduces significant overhead to the process and can impede performance In terms of configuring wireless networking software, you need to do very little Wireless network adapters are plug and play, so any modern version of Windows will immediately recognize a wireless network adapter when it is installed into a PCI or PC Card slot, or a USB port, prompting you to load any needed hardware drivers You will, however, need a utility to set parameters such as the network name Windows XP has built-in tools for configuring these settings, but for previous versions of Windows, you need to rely on configuration tools provided by the wireless network adapter vendor Figure 167 shows a typical wireless network adapter configuration utility Using this utility, you can determine your link state and signal strength, configure your wireless networking mode (discussed next), and set security encryption, power saving options, and so on.

Function InsertCustomer() As Integer Dim cust = New Customer With { Name = "Jim" } Dim myShop As New MyShopDataContext myShopCustomersInsertOnSubmit(cust) myShopSubmitChanges() Return custCustomerID End Function

The simplest wireless network consists of two or more PCs communicating directly with each other sans cabling or any other intermediary hardware More complicated wireless networks use a WAP to centralize wireless communication and bridge wireless network segments to wired network segments These two different methods are called ad-hoc mode and infrastructure mode

If a problem report is generated, it will contain information about your system and what was going on before the problem occurred You can view the contents of a problem report before it is sent, if you like If you ve had a problem and Vista generates a problem report, click the View Problem Details button to examine the contents of the report Vista also maintains a historical record of your computer s problems To go back later and check out the contents of problem reports: 1 Click the Start button 2 Click Control Panel 3 Click System And Maintenance 4 Click Problem Reports And Solutions 5 In the left pane, click View Problem History 6 Double-click the problem you want to examine An example problem report is shown in Figure 15-28

As shown here, each collection property, such as Customers, has an InsertOnSubmit method that takes an object of the collection s type, Customer in this case Don t forget to call SubmitChanges, or else you won t see any changes to your data The next section discusses updates Once the insert executes, with SubmitChanges, the new object, cust, will be updated with the new CustomerID, which you read and return to calling code

is sometimes called Ad-hoc mode peer-to-peer mode, with each wireless node in direct contact with each other node in a decentralized free-for-all, as shown in Figure 168 Two or more wireless nodes communicating in ad-hoc mode form what s called an Independent Basic Service Set (IBSS) Ad-hoc mode networks are suited for small groups of

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computers (less than a dozen or so) that need to transfer files or share printers Ad-hoc networks are also good for temporary networks such as study groups or business meetings

To update data, you need to get an object for the record you want to update, change the object you received, and then save the changes back to the database The following example shows how to update a record: C#:

Vista checks for solutions to problems in a couple of ways Let s take a closer look at how you can get help when a problem is detected