Windows Tips & Tricks UPDATE--February 12, 2007

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FAQs
Q. I configured Windows Media Center on my Windows Vista computer and now it won't enter sleep mode. What's wrong? Q. What's the difference between Windows Vista's sleep and hybrid sleep modes?
Q. Why do I have no option to hibernate on my Windows Vista Lock menu?
Q. How do I enable the Full Network Map in Windows Vista when the machine is part of a domain? Q. Why do my Windows Server 2003 and Windows XP machines display as computers that can't be placed in the Windows Vista network map?

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==== FAQs ====
by John Savill, FAQ Editor, jsavill@windowsitpro.com

Q. I configured Windows Media Center on my Windows Vista computer and now it won't enter sleep mode. What's wrong?

A. During configuration of Media Center, you'll see an option to always have shared media available to extender devices. If you select this option, when you try to put the computer in sleep mode, the computer simply locks instead of going into sleep mode. This functionality ensures that any shared media is available, which would not be the case if the computer entered sleep mode. If you want to reenable the ability to put the computer into sleep mode perform the following steps:
1. Start the Power Options Control Panel applet (Start, Control Panel, Power Settings).
2. Select the "Change plan settings" option for the current power plan.
3. On the settings dialog box, click the "Change advanced power settings."
4. Scroll down to the "Multimedia settings" option and expand the "When sharing media."
5. Change the setting to "Allow the computer to sleep."
6. Click OK, then close all open dialog boxes.

The "Allow the computer to enter Away Mode" is the setting that Media Center enables. The away mode functionality makes the computer appear to be off to the user but actually keeps the system running.

-------------------- Q. What's the difference between Windows Vista's sleep and hybrid sleep modes?

A. Pre-Vista Windows versions had options to hibernate, which saved the computer's memory state to disk followed by a shutdown, and standby, which placed the computer into a low power-consumption mode. Vista has the sleep and hybrid sleep modes. In the basic sleep mode, the computer enters a low power-consumption mode, keeping programs and data state in memory; in hybrid sleep mode, the computer enters a low power-consumption mode, keeping programs and data state in memory but also writes the memory content to disk, which means in the event of a power outage the computer's state can be recovered from the disk version of the memory state. Hybrid sleep takes slightly longer to go into low power-mode because the memory content has to be written to disk. On my computer, sleep takes 2 seconds to enter, whereas hybrid sleep takes 16 seconds. The extra 14 seconds is worth it to avoid losing data in the event of a power outage.

The Sleep button on the computer puts the computer into sleep or hybrid sleep mode, depending on the configuration of the computer. To configure the sleep options, follow these steps:
1. Start the Power Options Control Panel applet (Start, Control Panel, Power Settings).
2. Select the "Change plan settings" option for the current power plan.
3. On the settings dialog box, click the "Change advanced power settings."
4. Scroll down to the Sleep option, expand "Allow hybrid sleep" (on a laptop additional options for On battery or Plugged in" will be displayed) and click On or Off to allow/disallow hybrid sleep, as the figure at http://www.windowsitpro.com/articles/images/vistapowerenablehybridsleep.jpg shows.
5. Click OK and close open dialog boxes.

This setting updates the ACSettingIndex (1 for enabled, 0 for disabled) under the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes\\[GUID of scheme\] key.

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Q. Why do I have no option to hibernate on my Windows Vista Lock menu.

A. If you have hybrid sleep turned on, then sleep won't display on the Lock menu; if hybrid sleep is off, then hibernate will display. The figure at http://www.windowsitpro.com/articles/images/lockmenunohibernate.jpg shows the menu with hybrid sleep enabled, and therefore has no hibernate option.

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Q. How do I enable the Full Network Map in Windows Vista when the machine is part of a domain?

A. By default, the new Link Layer Topology Discovery (LLTD) protocol that's responsible for discovering information about a network is disabled when a Vista machine is part of a domain. (It's only enabled when the network is designated as Home, instead of Work or Public.). If you try to select the "View full map" from the Network and Sharing Center, a message will appear that says, "Network mapping is disabled by default on domain networks. Your network administrator can use Group Policy to enable mapping."

To enable this functionality locally on a machine, start the Group Policy Editor (GPE--gpedit.msc) as Administrator and navigate to the Local Computer Policy, Computer Configuration, Administrative Templates, Network, Link-Layer Topology Discovery branch. Double-click "Turn on Mapper I/O (LLTDIO) driver" and set it to Enabled, and select the check boxes for "Allow operation while in domain" and "Prohibit operation while in public network," as the figure at http://www.windowsitpro.com/articles/images/vistanetworkdiscoveryenabledomain.jpg shows. Click Apply, then click OK and close the GPE.

The option "Turn on Responder (RSPNDR) driver" allows the machine to participate and return information to LLTP requests from other machines and again can be enabled for domain environments.

You can find more information about the LLTD and other connectivity technologies at http://www.microsoft.com/whdc/rally/default.mspx .

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Q. Why do my Windows Server 2003 and Windows XP machines display as computers that can't be placed in the Windows Vista network map?

A. By default, XP machines don't have a Link Layer Topology Discovery (LLTD) responder to allow the XP machine to be placed in the network map. For XP Service Pack 2 (SP2) machines, a LLTD responder is available from http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=4f01a31d-ee46-481e-ba11-37f485fa34ea . The responder will allow XP machines to show in the network diagram as known devices. The savdalwks01 machine in the figure at http://www.windowsitpro.com/articles/images/vistanetworkmapexample.jpg is an XP machine with the LLTD responder installed.

There currently isn't an LLTP responder for any other OS, such as Windows 2003.

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