G - Physics – 06 – F
Patent
G - Physics
06
F
354/237
G06F 9/46 (2006.01) G06F 15/20 (1985.01)
Patent
CA 1232077
ABSTRACT OF THE DISCLOSURE A system incorporating a task control means including a task loader for transferring tasks from a storage means to a system memory means and a task manager responsive to operation of the system for controlling execution of tasks, and a document manager for loading document information in the form of document data structures from the storage means to the system memory and managing access to the document data structures by the tasks. The task manager incorporates task control blocks, which are used to manage the execution of tasks. The document manager incorporates document control blocks which are used to manage access to the document data structures by the tasks. The task control blocks reside in a task manager queue mechanism, with the task control blocks being linked by pointers in the preferred sequence of their execution. There is a document control block for each document data file in the system and the document files and document control blocks are designed to represent and relate to the structure of documents. Each document file includes at least one page, and each page including at least one area, wherein each area contains at least one type of information. Each area including, in an area containing text information, at least one column for containing text information. Each column including at least one line, and each line including a string of at least one text character, a reference to attributes applying to the characters of the string, and references to external data items associated with the line. The system also includes a screen manager for creating visual display screens representing data. Each screen is comprised of a virtual screen, which is comprised of one or more viewports onto data to be displayed. The screen manager includes a screen manager control structure containing information relating each screen to a corresponding task, and, for each screen, information describing certain properties of the screen, and information relating the screen to the data residing in the document structure to be to be displayed therein.
486101
Agarwal Arun K.
Knapp Suzanne C.
Lakness David R.
Teng Peter Y.
Smart & Biggar
Wang Laboratories Inc.
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