An example embodiment of a computer system that includes a removable agent that can be removed or installed without powering down the system includes a fixed bus agent and the replaceable bus agent. The fixed bus agent and the replaceable bus agent are electrically coupled together by a presence detect...http://www.google.de/patents/US6718416?utm_source=gb-gplus-sharePatent US6718416 - Method and apparatus for removing and installing a computer system bus agent without powering down the computer system
