There are a few exceptions to this rule in the cases where the command in question acts on all domains, the entire machine, or directly on the xen hypervisor.
Kunokuhluka okuningana emthethweni owedlule, njengasesimweni lapho umyalo usebenza kuzo zonke izizinda, umshini, noma ngqo kwiXen Hypervisor - IXen Hypervisor.