#include <WinAPI.au3>
#include <Constants.au3>
$sPID = Run('notepad.exe')
$hProc = _WinAPI_OpenProcess($PROCESS_ALL_ACCESS, False, $sPID)
_WinAPI_SetProcessAffinityMask($hProc, 0x01) ; Set affinity for 1-st core
;_WinAPI_SetProcessAffinityMask($hProc, 0x02) ; Set affinity for 2-nd core
;_WinAPI_SetProcessAffinityMask($hProc, 0x03) ; Set affinity for both cores
;_WinAPI_SetProcessAffinityMask($hProc, 0x09) ; Set affinity for both cores
_WinAPI_CloseHandle($hProc)