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#190861
I don't know if there's a way to directly read/write the EEPROM without an external programmer (someone correct me if I'm wrong). If you're looking to store runtime variables, you can use the built-in Arduino library. You could also create a sketch to run once and write those variables to the EEPROM which you can then access later on from another sketch.

https://www.arduino.cc/en/Reference/EEPROM