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Does any one has any idea, how to implement memory defragmentation in Flat Memory Model. I would like to know if any one knows how to modify the user access to the moved memory when memory is defraged using Garbage Collection or other Algo.

The key to memory defragmentation is not to fragment the memory in the first place, if it is possible in the type of project you're working on.  Write good code and a good memory manager to keep memory clean an neat.