The difference is the infrastructure (soap/wsdl/uddi, etc), you don't have to start from scratch, tools are available, usually you don't build a system in a vacuum (there can be another services, that you want to access from your application).
Joined: Mar 17, 2000
Good one for the WS forum...tossing it over.
Open Group Certified Distinguished IT Architect. Open Group Certified Master IT Architect. Sun Certified Architect (SCEA).