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The Deep description on Windows Services

We have tried our best efforts to explore the deepth of windows services and all the given information is gathered from Microsoft notes (As its microsoft product)


13. Service Name:-Browser
Executable Name:-svchost.exe -k netsvcs
Log On As:-LocalSystem
Description:-:: Maintains an up-to-date list of computers on your network, and supplies the list to programs that request it. The Computer Browser service is used by Windows-based computers that need to view network domains and resources. Computers designated as browsers maintain browse lists, which contain all shared resources used on the network. Earlier versions of Windows applications, such as My Network Places, the NET VIEW command, and the Microsoft Windows NT Explorer, all require browsing capability.
There are several different roles a computer may perform in a browsing environment. Under some conditions (such as failure or shutdown of a computer designated for a specific browser role) browsers-or potential browsers-may change to a different role of operation. Windows NT assigns the following special roles to computers running the Computer Browser service:
  • Domain Master Browser - Used only in domain environments. By default, the DC (domain controller) for a domain operates in this role. The domain master browser collects and maintains the master browse list of available servers for its domain, in addition to any names for other domains and workgroups used in the network. It also distributes and synchronizes the master browse list for master browsers on other subnets that have computers belonging to the same domain.
  • Master Browser - Collects and maintains the list of available network servers in its subnet. The master browser fully replicates its listed information with the domain master browser to obtain a complete browse list for the network, and distributes it to backup browsers located on the same subnet.
  • Backup Browser - The backup browser receives a copy of the browse list from the master browser for its subnet, and distributes it to other computers upon request.
  • Potential Browser - Capable of becoming a backup browser when instructed to by the subnet's master browser, the potential browser operates similarly to a non-browser under normal conditions.
  • Nonbrowser - A nonbrowser is configured so it cannot become a browser, and it does not maintain a browse list. It can operate as a browse client, requesting browse lists from other computers operating as browsers on the same subnet. When the Computer Browser service is turned off there is no mechanism to discover other computers to populate the My Network Places, and so on.
If this service is stopped or disabled, computer browsing features will not be available.
Avaliable on OS:-Windows XP Home, Windows XP Professional; Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition and Windows Server 2003, Web Edition.
Installed through:-Add/Remove Windows Components, Certificate Service
Startup type:-Automatic
Service status:-Started
This service depends on the following system components:-Server,Workstation
The following system components depend on this service:- None
Port Numbers used:-TCP: 139,UDP: 137

14. Service Name:-CryptSvc
Executable Name:-svchost.exe -k netsvcs
Log On As:-LocalSystem
Description:-: Provides key management services for your computer. The Cryptographic Service is comprised of three management services: Catalog Database Service, Protected Root Service, and Key Service.
  • Catalog Database Service - This part of the service is responsible for adding, removing, and looking up catalog files. Catalog files are used to bulk sign all the files in the operating system. So, this service is used by Windows File Protection (WFP), Driver Signing, and setup to verify signed files.
  • Protected Root Service - This part of the service is responsible for adding and removing Trusted Root Certification Authority certificates for the current user. It displays a service message box with the certificate's name and thumbprint. If the user clicks OK, the certificate is added to or removed from the current user's list of trusted root authorities. Only Local System has write access to this list. If this part of the service is turned off, the current user will not be able to add or remove Trusted Root Certificate Authority certificates.
  • Key Service - This part of the service allows administrators to enroll for certificates on behalf of the local machine account. To that end, it provides several pieces of functionality required for enrollment -- enumeration of available Certification Authorities, enumeration of available machine templates, the ability to create and submit a certificate request in the local machine context, and so on. Only administrators may enroll on behalf of the local machine account.
If this service is disabled, administrators will not be able to enroll for machine certificates and auto enrollment will not be able to automatically acquire the default set of machine certificates. Also, WFP and driver signing will not be able to check the signatures of the operating system files.
Avaliable on OS:-: Windows XP Home, Windows XP Professional; Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition and Windows Server 2003, Web Edition.
Installed through:-Default operating system installation
Startup type:-Automatic
Service status:-Started
This service depends on the following system components:-Remote Procedure Call
The following system components depend on this service:- None
Port Numbers used:-None

15. Service Name:-Dhcp
Executable Name:-svchost.exe -k netsvcs
Log On As:-NetworkService
Description:-:Dynamic Host Configuration Protocol (DHCP) Client manages network configuration by registering and updating IP addresses and Domain Name Server (DNS) names for your computer. You do not have to manually change the IP settings when a client, such as a roaming user, wanders throughout the network. The client is automatically given a new IP address regardless of the subnet it reconnects to-as long as a DHCP server is accessible from each of those subnets. There is no need to manually configure settings for DNS or Windows Internet Name Service (WINS). The DHCP server can give these settings to the client, as long as the DHCP server has been configured to issue such information. To enable this option on the client, simply select the Obtain DNS Server Address Automatically option button. There are no conflicts caused by duplicate IP addresses. If this service is stopped or disabled, you will not be able to obtain an IP address from a DHCP Server and you will have to configure a static IP address on the local machine. If this service is set to manual it will not demand start.
Avaliable on OS:-: Windows XP Home, Windows XP Professional; Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition and Windows Server 2003, Web Edition.
Installed through:-Default operating system installation
Startup type:-Automatic
Service status:-Started
This service depends on the following system components:-AFD Networking Support Environment,TCP/IP Protocol Driver,IPSEC Driver
The following system components depend on this service:-WinHTTP Web Proxy Auto-Discovery Service
Port Numbers used:-TCP: 68, UDP: 67, 68, 1029