You can generate multipoint driving directions between locations with the Route Finder Web Service. This Web service accepts x,y coordinate inputs for two or more locations, along with routing preferences, and returns a route map and textual driving directions for the suggested route.
Route Finder Web Service offers the following capabilities:
http://arcweb.esri.com/services/v2/RouteFinder.wsdl
https://arcweb.esri.com/services/v2/RouteFinder.wsdl
Note: HTTPS is available if you need added security to call ArcWeb Services. The Authentication Web Service and other ArcWeb Services must be accessed with the same IP address for the authentication token to be valid.
Interact with a live sample of a Route Finder Web Service client. For information on creating clients for ArcWeb Services, including downloadable code for JavaServer Pages (JSP) with Glue, C# ASP.NET, and VB ASP.NET, see Introducing client samples.