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User profiles are located by default on the local computer; one profile is created for each user who has logged on to that computer. When administrators configure profiles to roam, the data and settings in a user s profile are copied to a network server when the user logs off of the computer. The data and settings are then available to the user no matter where he or she next logs on to the network. While useful for mobile users, roaming user profiles are also beneficial for users who always use the same computer. Roaming user profiles provide a transparent way for such users to back up their profiles to a network server, thus protecting the information from individual system failure. If a user s primary workstation needs to be replaced, the new computer receives the user s profile from the server as soon as the user logs on. You can use roaming user profiles together with Remote OS Installation and Software Installation and Maintenance when you replace a computer. If a computer system fails and loses its data, you can use Remote OS Installation to install Windows XP Professional, use Software Installation and Maintenance to restore applications, and use roaming user profiles to restore critical information. Because a network copy of the data exists, you can easily reestablish links to critical information.

Microsoft Visual C# 2008 Express Edition: Build a Program Now!

7:

You need to solve common dial-up connection problems Users who rely on dial-up connections can suffer from a number of different problems because they have to connect to the ISP each time they wish to use the Internet, and because of possible connection problems over phone lines The following are some common problems and solutions: G My dial-up connection keeps disconnecting when I am not using it If the connection is automatically being terminated, take a look at the Idle Time Before Hanging Up setting on the Options tab of the Dial-up Connection Properties dialog box Also, be aware that many ISPs automatically disconnect idle users after a certain time period to conserve their resources G My connection is slow If the Internet connection is slow over the modem, it is normally a problem with the ISP s connection to the Internet or a limitation of your phone lines.

The Advanced tab of the Phone and Modem Options dialog box allows you to override the hardware and connection settings that were configured for the modem and serial port. The Extra initialization commands text box allows you to append to the standard initialization commands used to set up the modem at the start of a communications session. These can be standard AT-type commands or commands specific to your modem or communications device. Refer to the manufacturer s documentation for a description of available commands. The Advanced Port Settings button allows you to change the default configuration for the communications port used by your modem. The advanced COM port settings are available only for certain brands of modems. If you do not have one of these modems and want to change the assigned COM port, you must reinstall the modem and choose the desired COM port during the installation procedure. Table 26-7 describes the advanced port settings.

Part IV:

Verify the speeds you re getting over your dialup connection by examining the connection s properties after you dial up If they re slow, you might have noisy phone lines in your house (or between your house and the nearest fiber-optic connection) Also, contact your ISP to determine the amount of load being placed on its Internet connection G My connection always tries to dial a 1 in front of the number Right-click the dial-up connection, choose Properties, and on the General tab, change the phone number settings Or, if you are using dialing rules, change the dialing rule configuration so that it recognizes the phone number or area code as local See the next section for a discussion on dialing rules G I am prompted to approve the phone number every time the connection dials Right-click the dial-up connection, choose Properties, and select the Options tab.

Description A serial port containing a Universal Asynchronous Receiver/Transmitter (UART) chipset allows inbound and outbound information to be stored in associated first-in, first-out (FIFO) buffers until it can be received by the computer or dispatched by the modem. The sizes of the inbound and outbound buffers can be enabled by checking the Use FIFO buffers (requires 16550 compatible UART) option. The sizes of the inbound buffer (Receive buffer) and outbound buffer (Transmit buffer) can be modified by using the slider bars. Increasing the buffer sizes in 16550 UART-compatible serial ports can improve performance in high-speed modems. However, if you experience data loss or overrun errors, try lowering the buffer sizes or disabling the FIFO buffers.