Abstract: A data processing system provides annotation of a document through an electronic tablet, a keyboard and an audio assembly. An annotatable document is generated from a window of a multiwindow support program running independently of the annotation program in the data processing system. For each window of the multiwindow program, a working document is generated and is annotatable by the annotation program and apparatus. An annotatable document is also generated from the whole screen view of overlapping windows produced during execution of the multiwindow support program. Annotated working documents may be subsequently stored in and thereafter retrieved from the database of the multiwindow support program.

Abstract: A document manager controls the loading into memory from a mass storage means, such as a disk, a document file in disk file format. The loaded document file is stored in memory in document structure format for subsequent access thereto by a task, such as an application program. The loading of the document file into memory may be initiated by a task, either as a result of a user command or as a result of the operation of the task itself. In response to a request to load a document file, the document manager makes a request of a memory manager unit for an assigment of memory space to store the document file. After storage of the document file within the assigned memory space the document manager generates within the memory a document control block descriptive of various parameters associated with the loaded document. The document manager subsequently writes the location within memory of the generated document control block into an assigned location within the task requesting access to the document file.

Abstract: A data structure for use in a document processing system corresponds to a document comprised of one or more Pages. Each Page is subdivided into one or more nonoverlapping Areas, each Area in turn being comprised of one or more types of Layers. Each Layer type is expressive of a particular type of information such as text or graphics information. Different Layer types may be superimposed to comprise the contents of an Area.