How do I select user information with multiple databases using ASP & VB.NET?

Okay here it goes . . . I have a web application I am developing in Microsoft Visual Web Developer using ASP, VB.net, etc. that will allow "Sellers" to post ads for "Buyers" to view. When the Buyer searches for a product, each result needs to display the Seller's name, and the product's information. The problem being that the table that holds the various product information is located in one database and the user/membership information is stored in another database. Okay here it goes . . . I have a web applicatio