A Jolt request usually consists of a single call to a Tuxedo service using the call() method of the SessionPool. You supply the name of the Tuxedo service and a set of parameters to the call() method, and it returns a set of results from the Tuxedo service. It is possible to make multiple calls within a single transaction, which allows a servlet to comply with transactional demands of a Tuxedo application or preserve integrity between databases. This transaction is described in more detail in “Using a Transaction”.