RPC
Links
XML-RPC.com
XML-RPC is the home page for developers interested in this technology, XML-RPC is a Remote Procedure Calling protocol that works over the Internet. An XML-RPC message is an HTTP-POST request. The body of the request is in XML. A procedure executes on the server and the value it returns is also formatted in XML. Procedure parameters can be scalars, numbers, strings, dates, etc.; and can also be complex record and list structures.
MIME-RPC
A proposed standard for RPC using MIME. Includes specification, examples and discussion. Simple and leading edge.
XML-RPC.net
http://www.cookcomputing.com/xmlrpc/index.html
XML-RPC.NET is a class library for implementing XML-RPC Services and clients in the .NET environment. The XML-RPC.NET library is CLS-compliant and so can be called from any CLS-compliant language, the main examples being C# and VB.NET.