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I've tried datasocket, too limiting. Tcpip - there's got be a higher level than that. Shared network variables - daunting in complexity and still proprietary to NI. I found 0mq or zeromq the other day, which ticks a lot of boxes. I've written an Excel based test executive but wanted a robust and simple interface to control distributed slave instrument apps. It prototyped ok in datasocket if it wasn't for the fact that controls all appear as integers whatever their real type before they are written to. This makes auto-discovery of resources a pain. I don't see any discussion of zeromq on lavag, has anyone got experience of using the labview version - http://sourceforge.net/p/labview-zmq/wiki/Home/ ? It would be comforting to know it had proved to be reliable and scaled ok before spending any more time on it. I'm encouraged by some prototypes i've written for fault tolerance. Would welcome any experience with 0mq and other suggestions for simple networking without going completely back to basics. Cheers bob, uk