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Lies dir aber mal die Sektion About Memory Management - dort sollten deine Fragen eigentlich beantwortet werden. z.B.:
The global and local functions supported for porting from 16-bit code, or maintaining source code compatibility with 16-bit Windows. The global and local functions are slower than other memory management functions and do not provide as many features. Therefore, new applications should use the heap functions. However, the global functions are still used with DDE and the clipboard functions.
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Windows memory management does not provide a separate local heap and global heap, as 16-bit Windows does. As a result, there is no difference between the memory objects allocated by the GlobalAlloc and LocalAlloc functions.