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http://msdn.microsoft.com/en-us/library/ms684847(v=VS.85).aspx

DWORD_PTR WINAPI SetThreadAffinityMask(
  __in  HANDLE hThread,
  __in  DWORD_PTR dwThreadAffinityMask
);

BOOL WINAPI SetProcessAffinityMask(
  __in  HANDLE hProcess,
  __in  DWORD_PTR dwProcessAffinityMask
);

AND