A system and method in accordance with the invention reliably and non-intrusively identifies various conditions of a network. In particular, an embodiment of the invention can identify an operating system, including version and patch level, and a service, including version and patch level, of a remote...http://www.google.ca/patents/US7073198?utm_source=gb-gplus-sharePatent US7073198 - Method and system for detecting a vulnerability in a network
