How to program a word to flash on SAMC21 with Atmel ICE?

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I am wanting to be able to program a 32-bit word to an unused area of flash after flashing the main program with Atmel ICE.   This word will then be used at run time to determine certain behaviors.  For example, I could flash the value "0x000155aa" to memory location 0x0003fffc (the last 4 bytes of flash) which my program reads at run time and interpret as as parameters.  I did this in the past with an 8 bit Freescale processor and a PEMIcro programmer.