These actions permanently attach the plug to the cable. It also lacked a hard disk drive or the means to easily attach one. Also the sender can attach a digital signature to the document file. Like the resonators, these rails do not firmly attach to the frame. When users create topics they can optionally attach tags. The AGV can tow objects behind them in trailers to which they can autonomously attach. It provides an authentication mechanism to devices wishing to attach to a LAN or WLAN. There are a variety of soldering techniques used to attach components to a PCB. These muscles are unusual in that they do not attach to bone. Retroviruses can be retrained to attach to cells and replace DNA. Ligaments attach shoulder bones to each other, providing stability. Developers can attach data flow archetypes to each logical actor. These attach to and control discrete bundles of muscle fibers. They attach to other cells and stay in place in tissues. We must not attach an obsessional importance to it.