This act of linking from physical world objects is termed hardlinking or object hyperlinking. While hyperlinking occurs in other technologies, U.S. copyright litigation has centered on HTML. All these systems also provided extensive hyperlinking, graphics, and other capabilities. The plumber provides an inter-process communication mechanism which allows system-wide hyperlinking. A custom URI scheme, x-bdsk&colon;//citekey, allows hyperlinking to BibDesk references from any other application. Automatic hyperlinking describes the process or the software feature that produces autolinks. The online version was noted for its meticulous hyperlinking. It has to consider whether with the hyperlinking a new audience has been reached. The ruling also reversed earlier decisions affecting hyperlinking. Mere copy & paste or hyperlinking could also be seen as user-generated self-expression.