According to the invention, a system for providing real-time notification of purchaser requirements in a heterogeneous network environment is provided. The heterogeneous network environment can include a public packet switched network, such as the Internet, and a wireless network, such as a plurality...http://www.google.co.uk/patents/US6587838?utm_source=gb-gplus-sharePatent US6587838 - Method and system for conducting real time electronic commerce
