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View Thread: Need a little guidance.
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    JohnAskew

    For the desktop, a Windows Service may be the best always-on listener for your COM1 device.

    A Winforms app can communicate with the Windows Service which is pretty straight forward.

    You can also write a system tray icon app that surfaces the Windows Service with interactive UI, since they are not otherwise interactive.

    Why WCF? Is the interactivity network-wide? Sound like your messing with an LED display or something... TCP sockets...