and to or from other platforms 1 a 1 b or 1 n or from a location away from any well site such as central control center 10 the downhole control modules 22 interface to the surface controller 24 using an electrical wire i e hardwired connection alternatively data and command signals may be transmitted over optical fibers not shown using techniques known in the art the modules 22 contain circuitry and processors which act according to programmed instructions to control the actuation of the downhole devices and sensors used in production wells the downhole modules 22 in the wellbore can transmit and receive data and or commands to or from the surface and or to or from other devices in the borehole surface controller 24 can control the activities of the downhole control modules 22 by requesting data on a periodic basis and commanding the downhole modules to open or close electromechanical devices and to change monitoring parameters due to changes in long term borehole conditions turning again to fig2 an example of the downhole system is shown in an enlarged view of well number 2 b from platform 1 a depicting zones 3 a 3 b and 3 n in zone 3 a a slotted liner completion is shown at 69 associated with a packer 71 in zone.