Hello, it's interesting to see how your current pipe is working. In my practice I always use small files as flags. One process place some data into it, another process read or just check the file exists. Than it rename or delete flag as a confirmation about it understand the message. This approach I use also on the linux servers to interop between website scripts with low rights and server-side root-rights power scripts... So, please tell me your solution, I will try to reconstruct and find clue. Thanks, have a nice day