TAS3 Widget is a special user interaction device inserted into SP web sites (e.g. by means of iFrame), but pulled from the Dashboard.
The widget will refresh itself periodically from the dashboard and if necessary solicit interaction from the user. In many ways it is similar to web based instant messaging client.
If a WSP wants to interact with a user, it discovers the location of user's interaction service. Typically this will point to the dashboard. When interaction request is sent, the dashboard queues it to be delivered on the next refresh of the widget. When user replies, the interaction service call is completed and reslt returned to the WSP.
The URL for loading the widget to the SP user interface is determined either by an attribute passed on SSO or by discovering a special Widget resource.
The SSO attribute is named
urn:tas3:uiwidget:epr
The service type for discovery is called
urn:tas3:uiwidget
Other actions that can be integrated into the widget (so that the web page does not have to implement them separately):
Single logout