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    <p>If I'm writing it myself, I (almost) always use sockets to exchange data between apps. </p> <p>It's light weight, it works well on the same machine, across the local network or the Internet with no changes and it lets you communicate between apps with different permissions, like services (Windows messages cause problems here). </p> <p>It might not be a requirements for you, but I'm also a fan of platform independent transports, like TCP/IP.</p> <p>There are lots of free choices for Delphi. Here are a few that I know of. If you like blocking libraries, look at <a href="http://www.projectindy.org/index.en.aspx" rel="noreferrer">Indy</a> or <a href="http://www.ararat.cz/synapse/doku.php" rel="noreferrer">Synapse</a>. If you prefer non-blocking, check out <a href="http://www.overbyte.be/frame_index.html?redirTo=/products/ics.html" rel="noreferrer">ICS</a>.</p>
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    1. POExchange Data between two apps across PC on LAN
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    1. USBruce McGee
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    1. COSorry for my ignorance but what is Blocking and Non Blocking? I have never come across this terms even after programming for 15+ year now. In fact I have never come across such a requirement till date. This is for the first time that a client has asked for a facility that will allow our apps running on different PC to communicate and exchange data between them. I was actually planning to adopt DCOM but the fact is that using COM in Delphi is pure Pain in the...
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      1. USYogi Yang 007
    2. COI've had really bad experiences with DCOM as far back as the original MIDAS, which used DCOM as the default transport. If you decide to try it, do some investigation first. Blocking calls stop code execution until the call has finished. For interactive apps, these should be used in threads. Non-blocking calls return control immediately and notify you with an event when the call has completed. Both have their advantages and disadvantages.
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      1. USBruce McGee
    3. COCOM in Delphi is probably the easiest way to use COM, but it's usually not the best way to work across a network. Blocking and non-blocking relates to how the operating system handles the thread that initiates I/O (a blocked thread or process is not scheduled to run until it is unblocked). Blocking I/O causes the thread to be unscheduled by the OS scheduler until the I/O completes. Non-blocking I/O doesn't block the thread, the thread keeps on running, but needs to use a callback or polling or other mechanism to notify of completion.
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      1. USBarry Kelly
 

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