MACINTOSH, WINDOWS and LINUX are different Operating Systems with different underlying kernals. The Kernal is the part of the OS responsible for memory management, and it is the first module of an OS that gets loaded first.
PC computers are normally windows based.
It is possible to emulate MAC on a PC, and I imagine you could do the same for Linux. In this case, the underlying OS kernel would be windows based. And thus the system would manage the memory much like a PC.
Furthermore, the kernal is also responsible for general management of the computer system and services applications as well. MAC/Linux specific applications require a kernel that is capable of processing their requests.
Certain applications are capable of running on both MAC and PC, and probably Linux too- that is, because the kernel knows how to handle them. In other cases, the OS can be written to handle very special programs that are specific to that OS platform.
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