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In your scenario, the Client is not the Windows service, the client is the WebServer. So the windows service on computers would have to act as a server listening on may be tcp/ip ports for incoming webserver requests, processing them, and reply to the webserver.
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In your scenario, the Client is not the Windows service, the client is the WebServer. So the windows service on computers would have to act as a server listening on may be tcp/ip ports for incoming webserver requests, processing them, and reply to the webserver.

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I want to write a windows service and install it on about 15 computers spread throughout different states. &nbsp;I also have a separate web server that is located in Texas. &nbsp;The windows service on each computer should do a specific task when instructed by the Web server. &nbsp;The clients with teh windows services can't take this action based on polling (such as polling every 5 minutes to the web server) because what the clients have to do is sensitive down to the second.<br />
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I would like to know if this is possible. &nbsp;I know that I can have the windows service on each client contact the web server and query it or ask it a question, but can the webserver contact a specific client, sent it an xml string and expect a return answer? &nbsp;again, the client (windows services) can't poll the web server...it has to be done the other way around.<br />
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Any help is appreciated, if you can get me pointed in the right direction I would greatly appreciate it!
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I want to write a windows service and install it on about 15 computers spread throughout different states.  I also have a separate web server that is located in Texas.  The windows service on each computer should do a specific task when instructed by the Web server.  The clients with teh windows services can't take this action based on polling (such as polling every 5 minutes to the web server) because what the clients have to do is sensitive down to the second.

I would like to know if this is possible.  I know that I can have the windows service on each client contact the web server and query it or ask it a question, but can the webserver contact a specific client, sent it an xml string and expect a return answer?  again, the client (windows services) can't poll the web server...it has to be done the other way around.

Any help is appreciated, if you can get me pointed in the right direction I would greatly appreciate it!

WCF: Server to Client

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

Windows Communication Foundation (WCF) is a tool used to implement and deploy a service-oriented architecture (SOA) to support distributed computing where services have remote consumers. It features a runtime and a set of APIs in the .NET Framework for building connected, service-oriented applications. Services typically have a WSDL interface (Web Services Description Language) that any WCF client can use to consume the service, regardless of which platform the service is hosted on. WCF implements many advanced Web services (WS) standards such as WS-Addressing, WS-ReliableMessaging, WS-Security, RSS Syndication Services, WS-Discovery, routing and better support for REST services.