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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)


1. Service Name:- Alerter
Executable Name:- svchost.exe -k LocalService
Log On As:- LocalService
Description:- The Alerter service notifies selected users and computers of administrative alerts. Use the Alerter service to send alert messages to specified users that are connected on your network. Alert messages warn users about security, access, and user session problems. Alert messages are sent as messages from a server to a user's computer. The Messenger service must be running on the user's computer for the user to receive alert messages. If this service is stopped or disabled, applications that use the NetAlertRaise or NetAlertRaiseEx APIs will be unable to notify a user or computer (by a message box from the messenger service) that the administrative alert took place.
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:- Disabled
Service status:- Stopped
This service depends on the following system components:-Workstation
The following system components depend on this service:- None
Port Numbers used:-TCP: 2869, dynamic UDP: 1900

2. Service Name:- ALG
Executable Name:- ALG.EXE
Log On As:- LocalService
Description:- This subcomponent of the Internet Connection Sharing (ICS) / Internet Connection Firewall (ICF) service provides support for independent software vendors (ISVs) to write protocol plug-ins that allow their proprietary network protocols to pass through the firewall and work behind ICS. Application Layer Gateway plug-ins have the power to open ports and change data (such as ports and IP addresses) embedded in packets. File Transfer Protocol (FTP) is the only network protocol that has a plug-in shipping with Windows Server 2003 Standard Edition and Windows Server 2003 Enterprise Edition. The service listens for outgoing FTP traffic from an FTP client. It extracts the port that the FTP client is expecting to receive data from and creates an appropriate dynamic port mapping for the FTP data channel If this service is disabled, the Internet Connection Firewall and Internet Connection Sharing service will not start. The ALG service will start when set to manual if the Internet Connection Firewall and Internet Connection Sharing service is started.
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:-None
The following system components depend on this service:-Internet Connection Firewall (ICF) / Internet Connection Sharing (ICS)
Port Numbers used:-TCP: 21, dynamically allocated

3. Service Name:- AppMgmt
Executable Name:-svchost.exe -k netsvcs
Log On As:- LocalSystem
Description:- Provides software installation services, such as Assign, Publish, and Remove. This service processes requests to enumerate, install, and remove applications deployed via a corporate network. When you click Add in Add/Remove Programs on a computer joined to a domain, the program calls this service to retrieve the list of your deployed applications. The service is also called when you use Add/Remove Programs to install or remove an application, and in cases when a component (such as the shell or Component Object Model (COM)), makes an install request for an application to handle a file extension, COM class, or ProgID that is not present on the computer. The service is started by the first call made to it-it does not terminate once started. If this service is disabled, deployed application information will not be retrieved nor will this information appear with Add/Remove Programs, Add New Programs. No programs are available on the network will be displayed in the Add programs from your network dialog box. Stopping this service is not possible once started. This service must be disabled to prevent it from starting if not required.
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:- Default operating system installation
Startup type:- Manual
Service status:- Stopped
This service depends on the following system components:-None
The following system components depend on this service:-None
Port Numbers used:-None