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Controlling two independant VIs from a main VI.

I have a main VI running a main program. Acquiring Temperature Data from a DAQ system and writing values to Digital Output Card are the two sub tasks that the main program has to perform.

I want to create two seperate VIs, One VI that acquires temperature and writes it to a text file at its own speed and one writing values to the Digital output card at its own speed. These VIs should run independant of the main VI but the vaules should be accessible by the main VI.  How do I accomplish this?

How to control two autonomous VIs from a main VI? I also want to stop all the VIs if there is error in any of the VIs.

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