The invention provides an exclusive control unit among computers which can reliably perform an exclusive control for a shared resource while keeping a system running as a whole even if a problem occurs in any of the computers in the system. Each of the computers is connected to the others through a LAN...http://www.google.co.uk/patents/US5625795?utm_source=gb-gplus-sharePatent US5625795 - Exclusive control unit for a resource shared among computers
