1. One or more computer-readable storage media having stored thereon a plurality of application programming interface (APIs), the APIs executable by a computer processor, the plurality of APIs comprising: a first plurality of web services APIs, each of which being for writing a distributed, message-passing application, wherein each of the first plurality of web services APIs are represented with a first common namespace prefix corresponding with a System.ServiceModel namespace for logical grouping of the plurality of web services, wherein the System.ServiceModel namespace includes the following classes: EndpointAddress which represents the definition of the address of a web service; IChannelFactory which represents the base interface for actively creating channels; IListenerFactory which represent the base interface for listening at a network address; and Message which comprises the container within which all data exchanged between web services is encapsulated; a second plurality of web services APIs, each of which being for writing a distributed message-passing application and having certain common characteristics that are not present in all of the first plurality of web services APIs, wherein each of the second plurality of web services APIs are represented having both the first common namespace prefix and a second common namespace prefix that is a sub-namespace of the first common namespace prefix; and a third plurality of web services APIs, each of which being for writing a distributed message-passing application and having certain common characteristics that are not present in all of the first or second plurality of web services APIs, wherein each of the third plurality of web services APIs are represented having both the first common namespace prefix, the second namespace prefix, and a third common namespace prefix that is a sub-namespace of the second common namespace prefix.