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0 to 2 - 1) in that space can have a single byte as a value. Initially, none of them have values ( represents no value). Using or setting values in such a VAS would cause a memory exception.

Then the application's executable file is mapped into the VAS. Addresses in the process VAS are mapped to bytes in the EXE file. The OS manages the mapping:

The symbol represents values from bytes in the mapped file.

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