change a pointer of address of another application

Question

I need somebody to edit the title, I can\'t find better title.

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Assume a have this simple program called source.exe:

#include 

        

Answer 1

In first place, when you run the second program, the a in the first will be long gone (or loaded in a different position). In second place, many OS's protect programs by loading them in separate spaces.

What you really seem to be looking for is Inter-Process Communication (IPC) mechanisms, specifically shared memory or memory-mapped files.