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Instrument Control (GPIB, Serial, VISA, IVI)

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Remote closing of VISA sessions???

I have a network with three computers running LabView 6.1 The master collects data via ethernet and serial devices and distributes it to the slave computers via dataSocket.
If the master goes down (power loss, software problem ect.) one of the slave computers takes over. The PROBLEM I am having is getting the VISA session originally opened by the master closed. Does anyone know how to accomplish this???????????????
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What kind of VISA session are you using to collect data? TCP/IP, remote VISA, a GPIB-ENET/100?
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