Get and Set states on a PC application

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hi - first post.

i'm on forum find out if possible - haven't started looking it.

i want able , set states on application running on pc - have c++ commands or set application running don't know if possible via arduino.

the idea able press button connected arduino set state of pc application - in background arduino polling pc application state changes. depending on state set led colour.

thanks in advance , sorry newbie approach.

use regular serial/usb communication send commands , forth.


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