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Original article posted by Patman is a copy of http://msdn2.microsoft.com/en-us/library/aa366527.aspx

From the article:

The virtual address space or 'memory window' of a 32-bit application is limited to 4GB (2^32-1 bytes),

Why the "-1"? 4GB is 2^32 bytes, not 2^32-1. Martin MMM

The bit pattern 0x00000000 is (not only) on MS Windows reserved for the NULL pointer in C. Hence this address is not usable to store objects there. :-) --RokerHRO (talk) 22:12, 11 January 2010 (UTC)[reply]