An apparatus and method provide a companion application via a companion application corresponding to a host window provided by a host application, the companion window providing information or metadata descriptive of data in the host window. The host application and companion applications may be separate applications such that the host application is unaware of the companion application. The companion application may hook into the host application (e.g., via an application programming interface) and may monitor host application activities and/or data. Based on identification of data or events in the host application, the companion application may obtain information characterizing or providing a context for data provided by the host application. The host window and companion window may be attached to each other, the host window providing host application data and the companion window providing data describing the host application data.