OnExit, Exit

hHookKeybd := DllCall("SetWindowsHookEx"
   , Int, WH_KEYBOARD_LL := 13
   , Ptr, RegisterCallback("LowLevelKeyboardProc", "Fast")
   , Ptr, DllCall("GetModuleHandle", UInt, 0, Ptr)
   , UInt, 0, Ptr)
   
Sleep 15000
DllCall("UnhookWindowsHookEx", Ptr, hHookKeybd), hHookKeybd := ""
Return

Exit:
   (hHookKeybd && DllCall("UnhookWindowsHookEx", Ptr, hHookKeybd))
   ExitApp

LowLevelKeyboardProc(nCode, wParam, lParam)
{
   Return 1
}