If you have multiple nodes that includes load balancer and other SOA services and want to link them all to view a request as one transaction (e.g.: a request comes in through a load balancer, gets processed by app-server-1, which in turns calls service-2 that queries to DB-1 {or memcache}, Appneta Traceview can connect them all).

Or you can monitor your web-app using Appview Web too for synthetic monitoring. Plus you can monitor your network as well using Pathview.