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    <p>If this is Windows only, and you don't want to use 3rd party libraries, then you can skip TCP/IP and go for <a href="http://msdn.microsoft.com/en-us/library/aa365576(v=vs.85).aspx" rel="nofollow noreferrer">Mailslots</a>.</p> <p><strong>Edit</strong>: if you want guaranteed delivery, than named pipes is a better solution. <a href="https://stackoverflow.com/questions/512366/how-do-i-send-a-string-from-one-instance-of-my-delphi-program-to-another">This SO question</a> has a <a href="https://stackoverflow.com/questions/512366/how-do-i-send-a-string-from-one-instance-of-my-delphi-program-to-another/512796#512796">few</a> nice <a href="https://stackoverflow.com/questions/512366/how-do-i-send-a-string-from-one-instance-of-my-delphi-program-to-another/512405#512405">answers</a> with Delphi named pipe examples.</p> <blockquote> <p>A <em>mailslot</em> is a mechanism for one-way interprocess communications (IPC). Applications can store messages in a mailslot. The owner of the mailslot can retrieve messages that are stored there. These messages are typically sent over a network to either a specified computer or to all computers in a specified domain. A domain is a <em>group of workstations and servers that share a group name</em>.</p> </blockquote> <p>They don't need a Windows domain, they work over a LAN.</p> <p><a href="http://www.delphipages.com/" rel="nofollow noreferrer">DelphiPages</a> has a nice <a href="http://www.delphipages.com/articles/distributed_applications__the_easy_way__part_1_-9218.html" rel="nofollow noreferrer">run-down on doing IPC in Delphi</a>, including mailslots.</p> <p>--jeroen</p>
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    1. POSuggestions on writing a TCP IP messaging system (Client/Server) using Delphi 2010
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    1. USJeroen Wiert Pluimers
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    1. COMailslots don't guarantee delivery and have some other side effects, so they are not the best option. In OP's case this is claer pub-sub mechanism with dedicated server, and TCP would work fine. Yet, proper pub-sub with serializing of messages etc. is a non-trivial task.
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      1. USEugene Mayevski 'Allied Bits
    2. COthanks for the remark; I added the named pipes portion because of it.
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