Systems and methods for transmitting messages, such as real-time messages, from an entity outside a firewall to a recipient inside the firewall. The messages include the address of a bridgehead server exposed through the firewall and information identifying the recipient client. The network protected...http://www.google.co.uk/patents/US6415318?utm_source=gb-gplus-sharePatent US6415318 - Inter-enterprise messaging system using bridgehead servers
