To start with Connections, you must set up your ISBN-based lookup URL e.g.:

• http://opac.com/polaris/view.aspx?isbn={ISBN} for Polaris PowerPAC
• http://opac.com/uhtbin/cgisirsi/0/0/0/57/5?searchdata1={ISBN}&user_id=WEBSERVER&password=1234&library={PROFILE} for iBistro/iLink
• http://opac.com/ipac20/ipac.jsp?profile={PROFILE}&term={ISBN}&index=ISBNEX for HIP

{ISBN} and {PROFILE} are ChiliFresh tokens which will be parsed to particular ISBN and profile respectively. That way all the item-related links on Connections will link back to your OPAC.