Home screen widget allows the user to view dynamic data from several widgets concurrently without even launching the widgets on full screen. A home screen widget displays a non-interactive subset of data generated by a full screen widget.
WRT Widgets
Mini view enabled WRT widgets can be tested in Nokia N97 Emulator.
For more information on how to enable the mini view for WRT widgets refer to Web Developers Library
For new WRT Miniview Widget Example refer to Web Developers Library > Example Widget - STEW .
Native Widgets
The Homescreen Publishing API provided in this SDK allows application developers to enable the homescreen support for native application. Users can use this SDK to develop and test the native widgets on homescreen.
For more information on HSP API Doc refer to S60 5th Edition C++ Developer's Library > S60 C++ API Refrence