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Try this server-less <a href="http://lantalk.net" rel="ugc">Lan messenger</a>.
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Try this server-less Lan messenger [http://lantalk.net].

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Yahoo IM is free and works fine for a couple clients of mine for similar use. It supports both IM and chat.<br />
<br />
&nbsp;- Tom
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Yahoo IM is free and works fine for a couple clients of mine for similar use. It supports both IM and chat.

 - Tom

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We have more than 20,000 customers who could potentially use of of our computer. So we can't use any solution that needs accounts to be created for each user.
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We have more than 20,000 customers who could potentially use of of our computer. So we can't use any solution that needs accounts to be created for each user.

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<div class="content wysiwyg-content">
Hi, <br />
<br />
We would like to set up some kind of central chat services on our desktop computers. We have 100 desktop computers for customers located on 3 different floors of one buidling. The service desk for help &nbsp;is located on first floor. We would like our customers to use &nbsp;some kind of chat system to request for asistance from the service desk. <br />
<br />
Is there any product available in the market to do this?
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Hi, 

We would like to set up some kind of central chat services on our desktop computers. We have 100 desktop computers for customers located on 3 different floors of one buidling. The service desk for help  is located on first floor. We would like our customers to use  some kind of chat system to request for asistance from the service desk. 

Is there any product available in the market to do this?

Chat Client

Instant messaging (IM) is a type of online chat that offers real-time text transmission over the Internet. A LAN messenger operates in a similar way over a local area network. More advanced instant messaging can add file transfer, clickable hyperlinks, Voice over IP, or video chat. Non-IM types of chat include multicast transmission, usually referred to as "chat rooms". Depending on the IM protocol, the technical architecture can be peer-to-peer (direct point-to-point transmission) or client-server (a central server retransmits messages from the sender to the communication device).