The group of companies trying to establish OTP Open Trading Protocol standards as a way of providing users with a common experience of trading over the internet regardless of hardware, software or payment method, have won the support of a further ten companies. In addition to AT&T, HP, MasterCard and Mondex, the likes of IBM, Sun, Hitachi, British Telecom and Nokia are backing the initiative. OTP specifications will be published in the summer in the form of a set of rules that cover offers for sale; agreements to purchase (using existing protocols such as SET); transfer of goods and services; delivery; receipts for purchases; multiple methods of payment; and support for problem resolutions.