What types of webservices are asynchronous?
Any service that takes more than 60 seconds to respond is a likely asynchronous webservice. Business processes are often asynchronous, especially if they require human intervention or approval. Large data mining queries will often be asynchronous. Remote mobile devices that move in and out of coverage areas are also well suited for asynchronous webservices. Chained webservices, that is webservices that rely on other webservices, can also be asynchronous because, although each service in the chain my respond by itself in less than 60 seconds, the sum of their response times in sequence exceeds 60 seconds.
