We all here about widgets being the in-thing today but for the curious minds, it would be best what programming language is used to create them. Interface Description/ Definition Language or IDL is where most widgets originate from. Here is a better overview of how IDL is defined:
�An interface description language (or alternately, interface definition language), or IDL for short, is a computer language used to describe a software component’s interface. IDLs describe an interface in a language-neutral way, enabling communication between software components that do not share a language � for example, between components written in C++ and components written in Java.
IDLs are commonly used in remote procedure call software. In these cases the machines at either end of the “link” may be using different operating systems and computer languages. IDLs offer a bridge between the two different systems.
Software systems based on IDLs include Sun’s ONC RPC, The Open Group’s Distributed Computing Environment, IBM’s System Object Model, the Object Management Group’s CORBA, and SOAP for Web services.� -Wikipedia
Taken up close, widget interface should be the main concern when a programmer would create unique concepts on how interface on placed widgets on sites would take place. Defining their purpose should be the primary goal since websites would certainly select component widgets that are useful and complimentary to their site.