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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)


10. Service Name:- ClusSvc
Executable Name:-Clussvc.exe
Log On As:-Domain account specified when cluster service is configured
Description:-:Server clusters provide high availability and scalability for mission-critical applications such as databases, messaging systems, and file and print services. If one of the nodes in a cluster becomes unavailable either due to planned downtime for maintenance or unplanned downtime due to failure of a node, the operating system or an application, another node takes over to provide the service to the end-user-a process known as failover. When failover occurs, users who are accessing the cluster service continue to access the service, and are unaware that it is now being provided from a different server (node). Supports for up to 8-node server clusters in both Enterprise Server and Datacenter Server, however, a cluster cannot be made up of nodes running both Windows Server 2003 Enterprise Server and Windows Datacenter Server, they must all be running either Enterprise server or Datacenter server. A server cluster can be operated with some nodes running Windows 2000 and others running Windows Server as part of a rolling upgrade scenario. If this service is stopped or disabled, the cluster service itself and any applications or services hosted by the cluster service will be stopped.
Server clusters can be set up as one of three different configurations:-
  • Single node server clusters can be configured with, or without, external cluster storage devices. For single node clusters without an external cluster storage device, the local disk is configured as the cluster storage device. Single node configurations can be used to develop cluster aware applications or can be used in production to provide the local health monitoring and restart capabilities to applications.
  • Single quorum device server clusters have two or more nodes and are configured so that every node is attached to one or more cluster storage devices. The cluster configuration data is stored on a single cluster storage device known as the quorum disk.
  • Majority node set server clusters have two or more nodes where the nodes may or may not be attached to one or more cluster storage devices. The cluster configuration data is stored on multiple disks across the cluster and the Cluster service makes sure that this data is kept consistent across the different disks.
Avaliable on OS:-Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition.
Installed through:-Default operating system installation
Startup type:-Automatic
Service status:-Not started until the first node of a cluster is configured.
This service depends on the following system components:-Network Connections, Remote Procedure Call, Windows Time, Network Cluster Driver
The following system components depend on this service:- None
Port Numbers used:-TCP: 3343 ,UDP: 1204, 1094, 2036, 2008, 3343

11. Service Name:-EventSystem
Executable Name:-svchost.exe -k netsvcs
Log On As:-LocalSystem
Description:-Provides automatic distribution of events to subscribing COM (Component Object Model) components. COM+ Events extend the COM+ programming model to support late-bound events or method calls between the publisher or subscriber and the event system. Instead of repeatedly polling the server, the event system notifies interested parties as information becomes available. COM+ Events handle most of the event semantics for the publisher and subscriber. Publishers offer to publish event types, and subscribers request event types from specific publishers. Subscriptions are maintained outside both the publisher and subscriber and are retrieved when needed. This simplifies the programming model. The subscriber does not need to contain the logic for building subscriptions-building a subscription is as easy as building a COM component. The life cycle of the subscription is separate from that of either the publisher or the subscriber. Subscriptions can be built prior to either the subscriber or publisher being made active. If the service is disabled, you will be prompted to also stop the SENS (System Event Notification) service as well since SENS is dependent upon this service and logon and log off notifications will not occur and other inbox applications, such as Volume Snapshot service, will not work correctly.
Avaliable on OS:-Windows XP, Home Edition; Windows XP, Professional Edition; 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:-Started
This service depends on the following system components:-Remote Procedure Call
The following system components depend on this service:- System Event Notification, Window Internet Name Service (WINS), DHCP Server, COM+ System Application
Port Numbers used:-None

12. Service Name:-COMSysApp
Executable Name:-dllhost.exe /Processid:{02D4B3F1-FD88-11D1-960D-00805FC79235}
Log On As:-LocalSystem
Description:-:The COM+ system application hosts COM+ services and manages COM+ application configuration and tracking. COM+ applications will not work if the COM+ system application is disabled, also you will not be able to administer anything to do with COM+ or OLE registrations on the system. If you disable the MS DTC (Microsoft Distributed Transaction) service, any COM+ system applications will fail because this service needs local transactions to maintain its state.
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, COM+ Event System
The following system components depend on this service:- None
Port Numbers used:-None