io:address_space

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In computing, an address space is a range of discrete addresses (a unique identifier for the location of data).

The address space may be

physical composed of physical address
or virtual composed of virtual address

In a virtual address space, a virtual address maps to a physical address. See virtual address mapping

The following entity have an address space:

A process (logical entity)
A device (physical entity)

Example of physical entity with an address space:

a network host,
peripheral device,
disk sector,

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