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The first thing that springs to mind is to ask what OS you are using for the server?<br />
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I haven't found anything free but have a look at <a href="http://www.download.com/KeepAlive-Pro/3000-2084_4-10297409.html" rel="ugc">http://www.download.com/KeepAlive-Pro/3000-2084_4-10297409.html</a>&nbsp;which is Keep Alive Pro and has a 15 day free trial. It may help.
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The first thing that springs to mind is to ask what OS you are using for the server?

I haven't found anything free but have a look at http://www.download.com/KeepAlive-Pro/3000-2084_4-10297409.html [http://www.download.com/KeepAlive-Pro/3000-2084_4-10297409.html] which is Keep Alive Pro and has a 15 day free trial. It may help.

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Ok that program may not be the right one sorry... :-( I will see what I can find as I know there is something out there that can do this.
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Ok that program may not be the right one sorry... :-( I will see what I can find as I know there is something out there that can do this.

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I have a TCP socket Server in Windows PC and have 10 TCP socket Clients (Linux) on 10 PC. <br />
After the Server and the Clients start, the Clients will connect to the Server and <br />
does keep the connections for data transfer. <br />
The Server listen to and create a new work thread for the connected client socket......<br />
I want to know the 10 connections are always on, so the 10 client sockets must periodly <br />
send the bit data to the Server to make sure that it is connected.......<br />
I need to find the more efficient method to do that ? &nbsp;Maybe I can know each connection<br />
is down off immediately ?
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I have a TCP socket Server in Windows PC and have 10 TCP socket Clients (Linux) on 10 PC. 
After the Server and the Clients start, the Clients will connect to the Server and 
does keep the connections for data transfer. 
The Server listen to and create a new work thread for the connected client socket......
I want to know the 10 connections are always on, so the 10 client sockets must periodly 
send the bit data to the Server to make sure that it is connected.......
I need to find the more efficient method to do that ?  Maybe I can know each connection
is down off immediately ?

How can I detect the connected socket disconnected (broken down) instantly ?

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.

System Programming

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.

A programming language is a formal constructed language designed to communicate instructions to a machine, particularly a computer. Thousands of different programming languages have been created, mainly in the computer field, and many more still are being created every year. The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning). Some languages are defined by a specification document (for example, the C programming language is specified by an ISO Standard), while other languages (such as Perl) have a dominant implementation that is treated as a reference. Some languages have both, with the basic language defined by a standard and extensions taken from the dominant implementation being common.