Accessing external data using the IN clause. This article on the Microsoft Access Team Blog shows some of the ways to access data from outside your database by specifying the source of the data in the "In" clause of your query.
Quote:The other use of the IN keyword is as part of the SELECT statement or FROM clause, and is called the IN clause. The IN clause is used to access external data, and can be used in place of linked tables. For example, let's say that you had a SQL Server database that is used as part of an application, but you don't want to maintain a DSN to connect. You could use the IN clause in a query that uses a DSN-less connection to quickly read data from the external table.
It's one of those weird and wonderful things you can do in Access that many developers may never have tried!