A server is a computer or simply a device which manages the network resources. There are many types of servers. normally servers are dedicated, means they perform only the work fir which it is meant for, and it performs no other tasks. A computer can perform many tasks at once , a server refer to the program that manages resources for the clients.

Server platform:
This term is very often used with the Operating system. It is the hardware or software for the system. It an be said as the Engine that drives the server.

Server Types:

Applications Servers:

This type of server is widely used and it is a mediater between database and the end users.This is actually a middleware. Middleware is a software that connects two seperate applications.It is sometimes called as plumbing. such common middle ware categories contains:
TP Monitors
DCE Environments
RPC Systems
Object Request Broker (ORBs).
Database access systems
Message Passing

Audio and Video Servers:
This servers supports for online streaming for the websites. Streaming means transfering data such that it can be processed steady and continous stream. Such streaming techmologies are widely growing and gaining importance.

Chat Servers:
This enables large number of data exchange on the internet, it offers real time disscussion capabilities. Real time refers to the events that are simulated by a computer at the same speed that it would occur in real life.

Fax servers:
This type of servers were introduced toreduce the load on inoming and outgoing telephone resources. Big organizations need a dedicated FAX server.

FTP Server:
This servers is one of the oldest form of the service and the most primary ones. File transfer protocol makes it possible to move the files between computers securely.

Groupware Servers:
This type of server is used for user collabration by a software on this server.It works regardless of the location.

IRC Server:
This is a good option for the people those seek real time disscussion capability. the Internet relay chats consists of the various networks of the servers that allow the users to connect to each other via an IRC network.

List Server:
mailing list are managed by this server.It includes interactive discussion or one way lists that contain announcements,newsletter or advertising.

News Server:
It acts as the centralised distribution source for the thousand of public news group which is accessed over the USENET new netrwork.

Proxy Server:
This type of server is an intermediate between client and the external server. It filters the request and improves the importance and also share the connections.

Telnet Server:
This server enables users to log to the host computers and perfor tasks as if they were local.

Web Server:
Web server is responsible to serve the static content to the web browser by loading the files from the disk to the web browser. This contains a large amount of data exchange. This exchange between browser and the server uses HTTP.

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In the Microsoft windows Server operating system remote access technologies allows the clients to perform administrative tasks as well as they can work on the system as if they are working locally.

Components.

Telnet
Dial-up Remote access
Terminal Services are included in the Windows Server 2003 as remote access tevhnologies.

Telnet.

Windows 2003 and XP uses the telnet clients and telnet server components, which allows the users to establish the connection remotely based on the telnet protocol.Telnet allows you to create a remote console session on the host. We can run command line programs, shell programs,shell commands and scripts in a remote console session, using local command prompt, as you are locally logged on.

Telnet Client and Telnet Server are suited for admistrating the remote clients especially in mixed environments. That simply means the different environments can connect to each other as clients and server through Telnet. Using telnet offers you an advantage for minimal bandwidth and memory and processor resource are not enough
This is because Telnet Clients and Telnet Server use less memory and processor time than other remote management tools, and Telnet clients and servers transmit only plaintext (unencrypted characters) across the network.

Dial-Up Remote Access:

This is the technology that is available as apart of the Remote Access Services in the Microsoft Windows server 2003. Using the telecommunication infrastructure a dial-up client creates a temporary physical circuit(Virtual circuit) to a port on the Remote Access Server. If the connection is established i.e if the server accepts the dial-up connection from the client, the server forwards data packets between client and the network to which the server is attached.

The connection established between the remote access server(physical or logical) and the remote access client is created using dial-up equipment.Depending on the type of connection used,  The dial-up equipment and network infrastructure can vary.

Terminal Services:

This component of the windows server 2003 delivers the latest Windows-based applications and Windows server desktop.It provides the ability to establish multiple simultaneous client sessions on Windows Server 2003, allows same set of applications to run on diverse types of Desktop hardware. It also provides remote Desktop Administration, which reduces the overhead associated with remote access.

Almost all Organizations are always in a search for ways to reduce the costs of ownership and this is one of the major goals of Terminal Services. Terminal Services accomplish this goal more easily and cost-effectively

Terminal services allows:

* Centrally deploy and manage Windows-based applications.
* Remotely administer Windows Server 2003-based computers.

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