My blog post about using pipes for inter-process communication has a lot of interest. It has been updated by Arno Garrels from DuoData Software. Arno added 64-bit support and fixed code to compile with Delphi 7 to XE5 (earlier versions may compile however untested).
The original blog post is here. The link to the source code in the article point to the updated code.
Download updated source code from my website at
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This article is available from http://francois-piette.blogspot.be