A widespread technology in the Known Worlds, nanotech is the creation and use of microscopic machines. Virtually every appliance, building, and vehicle in the Commonwealth has nanotech components deployed for a variety of purposes. For example, when a High Guard ship needs replacement parts, small nano-machines can be used to assemble them molecule by molecule. More nano-machines continuously maintain and repair systems, minimizing failures and breakdowns. Still others defend against attacks by hostile nanomachines, which have a long history of use as weapons in modern warfare.