code:

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This will unload the Kernel, which will result in the shut down of windows.
 
RunDLL32.EXE krnl386.exe,exitkernel

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code:

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This will unload the Kernel, which will result in the shut down of windows.
 
RunDLL32.EXE USER.DLL,exitwindows

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code:

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This will reboot the computer without any dialog boxes
 
RunDLL32.EXE SHELL32.DLL,SHExitWindowsEx 2

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code:

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This will power the computer down (If the hardware is compatible with a power down command)
 
RunDLL32.EXE SHELL32.DLL,SHExitWindowsEx 1

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code:

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This will log the current user off without any dialog boxes.
 
RunDLL32.EXE SHELL32.DLL,SHExitWindowsEx 0

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