I would like to get a value from memory and use in my program then erite it back. E.g. Prog A stores the value 5 in memory, Prog B gets the value 5 then adds 2 to it the writes 7 back to the memory so when Prog A next accesses the variable it gets 7 not 5. I have tried some opening of processor reisters but the code didnt seem to work.

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