Windows.XP.in.a.Nutshell.1002005.2Ed [Electronic resources] نسخه متنی

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Appendix G. Services


Table 1 lists the background services installed by default in
Windows XP Professional. Note that some of the following may not be
present in your system (depending on your Windows edition or
installed components), and you may see some services on your own
computer that aren't listed here (which may have
been added after you installed Windows XP).

One of the advantages of services over standard applications and
drivers is that they are run when Windows starts, but before a user
logs in. So, for example, you could have an FTP daemon or VNC server
service running even when nobody is logged in.

Services can be started, stopped, and configured to automatically
start with the Services utility (services.msc).
By default, most of the services listed in Table 1 will remain dormant (stopped) until started by
the user. For more information on services, see the "Microsoft Management Console" in Chapter 4.

Table G-1. Services in Windows XP

Name


Filename


Description



Alerter


svchost.exe


Notifies selected users and computers of administrative alerts. If
the service is stopped, programs that use administrative alerts will
not receive them. If this service is disabled, any services that
explicitly depend on it will fail to start.



Application Layer
Gateway Service


alg.exe


Provides support for third-party protocol plug-ins for Internet
Connection Sharing and the Internet Connection Firewall.



Application Management


svchost.exe


Provides software installation services such as Assign, Publish, and
Remove.


ATM ARP Client Protocol


atmarpc.sys


ATM ARP Client Protocol.



Automatic Updates


svchost.exe


Enables the download and installation of critical Windows updates. If
the service is disabled, the operating system can be manually updated
at the Windows Update web site.



Background
Intelligent Transfer Service


svchost.exe


Uses idle network bandwidth to transfer data.


ClipBook


clipsrv.exe


Enables ClipBook Viewer to store information and share it with remote
computers. If the service is stopped, ClipBook Viewer will not be
able to share information with remote computers. If this service is
disabled, any services that explicitly depend on it will fail to
start.



COM+ Event System


svchost.exe


Supports System Event Notification Service (SENS), which provides
automatic distribution of events to subscribing Component Object
Model (COM) components. If the service is stopped, SENS will close
and will not be able to provide logon and logoff notifications. If
this service is disabled, any services that explicitly depend on it
will fail to start.



COM+ System
Application


dllhost.exe


Manages the configuration and tracking of Component Object Model
(COM)+-based components. If the service is stopped, most COM+-based
components will not function properly. If this service is disabled,
any services that explicitly depend on it will fail to start.



Computer Browser


svchost.exe


Maintains an updated list of computers on the network and supplies
this list to computers designated as browsers. If this service is
stopped, this list will not be updated or maintained. If this service
is disabled, any services that explicitly depend on it will fail to
start.




Cryptographic
Services


svchost.exe


Provides three management services: Catalog Database Service, which
confirms the signatures of Windows files; Protected Root Service,
which adds and removes Trusted Root Certification Authority
certificates from this computer; and Key Service, which helps enroll
this computer for certificates. If this service is stopped, these
management services will not function properly. If this service is
disabled, any services that explicitly depend on it will fail to
start.



DHCP Client


svchost.exe


Manages network configuration by registering and updating IP
addresses and DNS names.



Direct Parallel


raspti.sys


Direct Parallel.



Direct Parallel
Link Driver


ptilink.sys


Direct Parallel Link Driver.



Distributed Link Tracking
Client


svchost.exe


Maintains links between NTFS files within a computer or across
computers in a network domain.



Distributed
Transaction Coordinator


msdtc.exe


Coordinates transactions that span multiple resource managers, such
as databases, message queues, and filesystems. If this service is
stopped, these transactions will not occur. If this service is
disabled, any services that explicitly depend on it will fail to
start.



DNS Client


svchost.exe


Resolves and caches Domain Name System (DNS) names for this computer.
If this service is stopped, this computer will not be able to resolve
DNS names and locate Active Directory domain controllers. If this
service is disabled, any services that explicitly depend on it will
fail to start.



Error Reporting Service


svchost.exe


Allows error reporting for services and applications running in
non-standard environments.



Event Log


services.exe


Enables event log messages issued by Windows-based programs and
components to be viewed in Event Viewer. This service cannot be
stopped.



Fast User Switching
Compatibility


svchost.exe


Provides management for applications that require assistance in a
multiple user environment.


Fax


fxssvc.exe


Enables you to send and receive faxes, utilizing fax resources
available on this computer or on the network.



Generic Packet
Classifier


msgpc.sys


Generic Packet Classifier.



Help and Support


svchost.exe


Enables Help and Support Center to run on this computer. If this
service is stopped, Help and Support Center will be unavailable. If
this service is disabled, any services that explicitly depend on it
will fail to start.



Human Interface Device Access


svchost.exe


Enables generic input access to Human Interface Devices (HID), which
activates and maintains the use of predefined hot buttons on
keyboards, remote controls, and other multimedia devices. If this
service is stopped, hot buttons controlled by this service will no
longer function. If this service is disabled, any services that
explicitly depend on it will fail to start.


IMAPI CD-Burning COM Service


imapi.exe


Manages CD recording using Image Mastering Applications Programming
Interface (IMAPI). If this service is stopped, this computer will be
unable to record CDs. If this service is disabled, any services that
explicitly depend on it will fail to start.



Indexing Service


cisvc.exe


Indexes contents and properties of files on local and remote
computers; provides rapid access to files through flexible querying
language.



Internet
Connection Firewall (ICF) /

Internet Connection Sharing
(ICS)


svchost.exe


Provides network address translation, addressing, name resolution
and/or intrusion prevention services for a home or small office
network.


IP in IP Tunnel Driver


ipinip.sys


IP in IP Tunnel Driver.


IP Network Address
Translator


ipnat.sys


IP Network Address Translator.


IP Traffic Filter Driver


ipfltdrv.sys


IP Traffic Filter Driver.


IPSEC Services


lsass.exe


Manages IP security policy and starts the ISAKMP/Oakley (IKE) and the
IP security driver.



IPX Traffic
Filter Driver


nwlnkflt.sys


IPX Traffic Filter Driver.



IPX Traffic
Forwarder Driver


nwlnkfwd.sys


IPX Traffic Forwarder Driver.



Logical Disk Manager


svchost.exe


Detects and monitors new hard disk drives and sends disk volume
information to Logical Disk Manager Administrative Service for
configuration. If this service is stopped, dynamic disk status and
configuration information may become out of date. If this service is
disabled, any services that explicitly depend on it will fail to
start.



Logical Disk
Manager Administrative Service


dmadmin.exe


Configures hard disk drives and volumes. The service runs only for
configuration processes and then stops.



Messenger


svchost.exe


Transmits net send and Alerter service messages between clients and
servers. This service is not related to Windows Messenger. If this
service is stopped, Alerter messages will not be transmitted. If this
service is disabled, any services that explicitly depend on it will
fail to start.


MS Software Shadow Copy Provider


dllhost.exe


Manages software-based volume shadow copies taken by the Volume
Shadow Copy service. If this service is stopped, software-based
volume shadow copies cannot be managed. If this service is disabled,
any services that explicitly depend on it will fail to start.


NDIS Usermode I/O Protocol


ndisuio.sys


NDIS Usermode I/O Protocol.


Net Logon


lsass.exe


Supports pass-through authentication of account logon events for
computers in a domain.


NetBIOS
Interface


netbios.sys


NetBIOS Interface.


NetMeeting Remote
Desktop Sharing


mnmsrvc.exe


Enables an authorized user to access this computer remotely by using
NetMeeting over a corporate intranet. If this service is stopped,
remote Desktop sharing will be unavailable. If this service is
disabled, any services that explicitly depend on it will fail to
start.



Network Connections


svchost.exe


Manages objects in the Network and Dial-Up Connections folder, in
which you can view both local area network and remote connections.



Network DDE


netdde.exe


Provides network transport and security for Dynamic Data Exchange
(DDE) for programs running on the same computer or on different
computers. If this service is stopped, DDE transport and security
will be unavailable. If this service is disabled, any services that
explicitly depend on it will fail to start.


Network DDE
DSDM


netdde.exe


Manages Dynamic Data Exchange (DDE) network shares. If this service
is stopped, DDE network shares will be unavailable. If this service
is disabled, any services that explicitly depend on it will fail to
start.



Network Location Awareness
(NLA)


svchost.exe


Collects and stores network configuration and location information,
and notifies applications when this information changes.



NT LM Security
Support Provider


lsass.exe


Provides security to remote procedure call (RPC) programs that use
transports other than named pipes.



Performance
Logs and Alerts


smlogsvc.exe


Collects performance data from local or remote computers based on
preconfigured schedule parameters, then writes the data to a log or
triggers an alert. If this service is stopped, performance
information will not be collected. If this service is disabled, any
services that explicitly depend on it will fail to start.


Plug and
Play


services.exe


Enables a computer to recognize and adapt to hardware changes with
little or no user input. Stopping or disabling this service will
result in system instability.



Portable Media Serial Number


svchost.exe


Retrieves the serial number of any portable music player connected to
your computer.



Print Spooler


spoolsv.exe


Loads files to memory for later printing.


Protected
Storage


lsass.exe


Provides protected storage for sensitive data, such as private keys,
to prevent access by unauthorized services, processes, or users.


QoS RSVP


rsvp.exe


Provides network signaling and local traffic control setup
functionality for QoS-aware programs and control applets.



RAS
Asynchronous Media Driver


asyncmac.sys


RAS Asynchronous Media Driver.


Rdbss


rdbss.sys


Rdbss.


Remote Access Auto Connection Driver


rasacd.sys


Remote Access Auto Connection Driver.



Remote Access Auto
Connection Manager


svchost.exe


Creates a connection to a remote network whenever a program
references a remote DNS or NetBIOS name or address.


Remote Access Connection Manager


svchost.exe


Creates a network connection.


Remote
Access IP ARP Driver


wanarp.sys


Remote Access IP ARP Driver.


Remote Access NDIS TAPI Driver


ndistapi.sys


Remote Access NDIS TAPI Driver.


Remote Access NDIS WAN Driver


ndiswan.sys


Remote Access NDIS WAN Driver.


Remote Access PPPOE Driver


raspppoe.sys


Remote Access PPPOE Driver.


Remote Desktop Help Session Manager


sessmgr.exe


Manages and controls Remote Assistance. If this service is stopped,
Remote Assistance will be unavailable. Before stopping this service,
see the Dependencies tab of the Properties dialog box.




Remote Procedure Call (RPC)


svchost


Provides the endpoint mapper and other miscellaneous RPC services.



Remote Procedure
Call (RPC) Locator


locator.exe


Manages the RPC name service database.



Remote Registry


svchost.exe


Enables remote users to modify registry settings on this computer. If
this service is stopped, the registry can be modified only by users
on this computer. If this service is disabled, any services that
explicitly depend on it will fail to start.



Routing and Remote Access


svchost.exe


Offers routing services to businesses in local area and wide area
network environments.


Secdrv


secdrv.sys


SafeDisc driver.



Secondary Logon


svchost.exe


Enables starting processes under alternate credentials. If this
service is stopped, this type of logon access will be unavailable. If
this service is disabled, any services that explicitly depend on it
will fail to start.



Security Accounts
Manager


lsass.exe


Stores security information for local user accounts.



Server


svchost.exe


Supports file, print, and named-pipe sharing over the network for
this computer. If this service is stopped, these functions will be
unavailable. If this service is disabled, any services that
explicitly depend on it will fail to start.



Shell Hardware Detection


svchost.exe


Provides notifications for AutoPlay hardware events.



Smart Card


SCardSvr.exe


Manages access to smart cards read by this computer. If this service
is stopped, this computer will be unable to read smart cards. If this
service is disabled, any services that explicitly depend on it will
fail to start.


Smart Card
Helper


SCardSvr.exe


Enables support for legacy nonplug and play smart-card readers used
by this computer. If this service is stopped, this computer will not
support legacy reader. If this service is disabled, any services that
explicitly depend on it will fail to start.



SSDP Discovery Service


svchost.exe


Enables discovery of UPnP devices on your home network.



System Event Notification


svchost.exe


Tracks system events such as Windows logon, network, and power
events. Notifies COM+ Event System subscribers of these events.



System Restore Service


svchost.exe


Performs system restore functions. To stop service, turn off System
Restore from the System Restore tab in My Computer
Properties.



Task Scheduler


svchost.exe


Enables a user to configure and schedule automated tasks on this
computer. If this service is stopped, these tasks will not be run at
their scheduled times. If this service is disabled, any services that
explicitly depend on it will fail to start.



TCP/IP NetBIOS Helper


svchost.exe


Enables support for NetBIOS over TCP/IP (NetBT) service and NetBIOS
name resolution.


TCP/IP Protocol Driver


tcpip.sys


TCP/IP Protocol Driver.



Telephony


svchost.exe


Provides Telephony API (TAPI) support for programs that control
telephony devices and IP-based voice connections on the local
computer and, through the LAN, on servers that are also running the
service.


Telnet


tlntsvr.exe


Enables a remote user to log on to this computer and run programs,
and supports various TCP/IP Telnet clients, including Unix-based and
Windows-based computers. If this service is stopped, remote user
access to programs might be unavailable. If this service is disabled,
any services that explicitly depend on it will fail to start.



Terminal Services


svchost.exe


Allows multiple users to be connected interactively to a machine as
well as the display of Desktops and applications to remote computers.
The underpinning of Remote Desktop (including RD for Administrators),
Fast User Switching, Remote Assistance, and Terminal Server.



Themes


svchost.exe


Provides user experience theme management.


Uninterruptible Power Supply


ups.exe


Manages an uninterruptible power supply (UPS) connected to the
computer.



Universal Plug and Play
Device Host


svchost.exe


Provides support to host Universal Plug and Play devices.



Upload Manager


svchost.exe


Manages synchronous and asynchronous file transfers between clients
and servers on the network. If this service is stopped, synchronous
and asynchronous file transfers between clients and servers on the
network will not occur. If this service is disabled, any services
that explicitly depend on it will fail to start.



Volume Shadow Copy


vssvc.exe


Manages and implements Volume Shadow Copies used for backup and other
purposes. If this service is stopped, shadow copies will be
unavailable for backup and the backup may fail. If this service is
disabled, any services that explicitly depend on it will fail to
start.




WAN Miniport
(L2TP)


rasl2tp.sys


WAN Miniport (L2TP).



WAN
Miniport (PPTP)


raspptp.sys


WAN Miniport (PPTP).



WebClient


svchost.exe


Enables Windows-based programs to create, access, and modify
Internet-based files. If this service is stopped, these functions
will not be available. If this service is disabled, any services that
explicitly depend on it will fail to start.


WebDav Client Redirector


mrxdav.sys


WebDav Client Redirector.




Windows Audio


svchost.exe


Manages audio devices for Windows-based programs. If this service is
stopped, audio devices and effects will not function properly. If
this service is disabled, any services that explicitly depend on it
will fail to start.



Windows Image Acquisition
(WIA)


svchost.exe


Provides image acquisition services for scanners and cameras.



Windows
Installer


msiexec.exe


Installs, repairs and removes software according to instructions
contained in .MSI files.



Windows
Management Instrumentation


svchost.exe


Provides a common interface and object model to access management
information about operating systems, devices, applications and
services. If this service is stopped, most Windows-based software
will not function properly. If this service is disabled, any services
that explicitly depend on it will fail to start.



Windows
Management Instrumentation Driver Extensions


svchost.exe


Provides systems management information to and from drivers.




Windows Time


svchost.exe


Maintains date and time synchronization on all clients and servers in
the network. If this service is stopped, date and time
synchronization will be unavailable. If this service is disabled, any
services that explicitly depend on it will fail to start.



Wireless Zero Configuration


svchost.exe


Provides automatic configuration for the 802.11 adapters.


WMI Performance Adapter


wmiapsrv.exe


Provides performance library information from WMI HiPerf providers.



Workstation


svchost.exe


Creates and maintains client network connections to remote servers.
If this service is stopped, these connections will be unavailable. If
this service is disabled, any services that explicitly depend on
it will fail to start.


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