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I'm looking for a messenger or texting tool between PCs. <br />
There will be a main station which can <b>send text to an individual or a group</b>. <br />
And there will be a group who receives it and can send or reply <b>ONLY to the main station</b>, but among the group, they can not recognize each other, nor can send or reply. <br />
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There are many messengers and chat tool, but they all allow a group chat which doesn't fit to dispatching senario.<br />
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After I wrote down, basically what I want to find is, some very simple texting tool which can be used for bidding. <br />
There are multiple stations with the software installed, they will standby and receive a message from the main station, and they reply with 'T' or simple text showing interest. Then, the main station continues the first bidder with message. <br />
It should be simple so that only messaging and/or file exchange are the only need
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I'm looking for a messenger or texting tool between PCs. 
There will be a main station which can send text to an individual or a group. 
And there will be a group who receives it and can send or reply ONLY to the main station, but among the group, they can not recognize each other, nor can send or reply. 

There are many messengers and chat tool, but they all allow a group chat which doesn't fit to dispatching senario.

After I wrote down, basically what I want to find is, some very simple texting tool which can be used for bidding. 
There are multiple stations with the software installed, they will standby and receive a message from the main station, and they reply with 'T' or simple text showing interest. Then, the main station continues the first bidder with message. 
It should be simple so that only messaging and/or file exchange are the only need

Messenger or Texting tool for dispatchers

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).

Chat / IM

Software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of programs, libraries and related non-executable data (such as documentation). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level programming languages than machine language. High-level languages are translated into machine language using a compiler or interpreter or a combination of the two.

Software

A miscellany is defined as a "collection of various pieces of writing by different authors", but it has come to mean something "Of items gathered or considered together of various types or from different sources" or "a collection or group composed of members or elements of different kinds". The word "miscellaneous" comes from the Latin word "miscere", meaning "to mix." You might have heard the expression "a mixed bag," which applies when you don't quite know what you're going to get. More commonly, a miscellaneous group is made up of an odd group of things that don't fit anywhere else.