A method of monitoring a status condition of a first server with a second server in a server network, and also providing synchronization and messaging between the two servers, the method including: transmitting a software-generated pulse waveform from the first server to a device coupled to the first...http://www.google.de/patents/US6523131?utm_source=gb-gplus-sharePatent US6523131 - Method for communicating a software-generated pulse waveform between two servers in a network
