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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)


4. Service Name:-Aspnet_state
Executable Name:-aspnet_state.exe
Log On As:-Network Service
Description:- ASP State Service provides support for out-of-process session states for ASP. ASP has a concept of session state - a listing of values associated with the client session is accessible from ASP pages through the Session property. There are three options provided to store session data: In process; SQL database; and out-of-process. The ASP State Service stores session data out-of-process. The service communicates with ASP using sockets. If this service is stopped or disabled, out of process requests will not be processed.
Avaliable on OS:-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, Application Server, ASP.NET
Startup type:- Mannual
Service status:- Stopped
This service depends on the following system components:-None
The following system components depend on this service:- None
Port Numbers used:-TCP: 42424

5. Service Name:-Wuauserv
Executable Name:-svchost.exe -k netsvcs
Log On As:-LocalSystem
Description:-Enables the download of updates from Microsoft's Windows Update Web site. This service keeps your computer up-to-date automatically with the latest updates, drivers and enhancements from Microsoft. You no longer have to search for critical updates and information; Windows Update delivers them directly to your computer if configured. Windows recognizes when you are online and uses your Internet connection to search for downloads from the Windows Update page on the Microsoft Web site. A message appears on your desktop to let you know when new updates are available. The Automatic Update feature can be turned off through the Systems setting in the Control Panel or by right mouse clicking My Computer and selecting Properties. You can also use the MMC Group Policy Object Editor snap in administrative template to configure an intranet server to host updates from the Microsoft Update Web sites. This setting lets you specify a server on your network to function as an internal update service. The Automatic Updates client will search this service for updates that apply to the computers on your network. Stopping or disabling this service has no effect on the rest of the operating system. The user will have to update their computer manually from the Windows Update Web site located at http://v4.windowsupdate.microsoft.com/en/default.asp.
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:-None
The following system components depend on this service:-None
Port Numbers used:-TCP: 80

6. Service Name:-BITS
Executable Name:-svchost.exe -k netsvcs
Log On As:- LocalSystem
Description:- Use Background Intelligent Transfer Service (BITS) to transfer files asynchronously between a client and an HTTP server. BITS is a background file transfer mechanism and queue manager. Requests to the BITS service are submitted and the files are transferred uses idle network bandwidth so that other network related activities, such as browsing, are not affected. BITS suspends the transfer if a connection is lost or if the user logs off. BITS persists transfer information while the user is logged off, across network disconnects, and during machine restarts. When the user logs on, BITS resumes the user's transfer job. BITS uses a queue to manage file transfers. You can prioritize transfer jobs within the queue and specify whether the files are transferred in the foreground or background. Background transfers are optimal in that BITS uses idle network bandwidth to transfer the files and will increase or decrease the rate (throttle) at which files are transferred based on the amount of idle network bandwidth available. If a network application begins to consume more bandwidth, BITS decreases its transfer rate to preserve the user's interactive experience. BITS provides one foreground and three background priority levels that you can use to prioritize transfer jobs. Higher priority jobs preempt lower priority jobs; whereas, jobs at the same priority level share transfer time (round-robin scheduling prevents a large job from blocking the transfer queue). Lower priority jobs do not receive transfer time until all higher priority jobs are complete or in an error state. The BITS service can be demand started when set to manual and the first job is submitted. When all outstanding jobs are completed, the BITS service will stop. When stopped: If the service is stopped, features such as Automatic Update, and MSN Explorer will be unable to automatically download programs and other information until the BITS service has started. When disabled: If this service is disabled, any services that explicitly depend on this service will fail to transfer files if they do not have a fail safe mechanism to transfer files directly through other methods such as Internet Explorer.
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:- Manual
Service status:- Stopped
This service depends on the following system components:-Remote Procedure Call
The following system components depend on this service:-None
Port Numbers used:-TCP :80