Simplifying affiliated transactions through an auto-populating web page sub-window

A transaction web page method provides a transaction web page from a first server at a first service address to a user client computer where user-specific transaction information is incorporated into the web page in connection with a first transaction. A transaction sub-window is provided from the first service address in connection with a second transaction that is separate and distinct from the first transaction. The transaction sub-window is rendered adjacent to the transaction web page and is auto-populated with user-specific transaction information from the transaction web page. Upon user activation of the second transaction, transaction information for the second transaction is transmitted to a second server that is at a second service address that is different from the first server service address to provide processing of the second transaction