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UNIX system concepts for DOS programmers

Virtual memory

Virtual memory is the mechanism by which more memory can be allocated than is physically present in the machine. This is enabled by paging small (4KB) pages of memory from main memory to a swap area on hard disk when they are not needed. These pages can be paged in on demand when referenced at a later time. Since program code will not be modified, it need not be paged out but is instead demand-paged in from the filesystem as required.


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