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How to differentiate local memory and global memory? 
Local and global memory allocation is applicable with Intel 80x86 CPUs.
Some main difference b/n local and global variables are given below:

1.Using local memory allocation we can access the data of the default memory segment,Where as with global memory allocation we can access the default data,located outside the segment,usually in its own segment.   
2.If our program is a small or medium model program , the default memory pool is local,Where as If our program uses the large or compact memory model, the default memory pool is global.