CorVision is a fourth generation programming tool (4GL) currently owned by Attunity, Inc. CorVision was developed by Cortex Corporation for the VAX/VMS

OpenVMS

OpenVMS , previously known as VAX-11/VMS, VAX/VMS or VMS, is a computer server operating system that runs on VAX, Alpha and Itanium-based families of computers. Contrary to what its name suggests, OpenVMS is not open source software; however, the source listings are available for purchase...

 ISAM

ISAM

ISAM stands for Indexed Sequential Access Method, a method for indexing data for fast retrieval. ISAM was originally developed by IBM for mainframe computers...

 environment. Although Cortex beta tested CorVision-10 which generated for PCs but CorVision itself stayed anchored on VMS. CorVision-10 proved more difficult than hoped, and was never released.
CorVision can be traced back to 1972 when Lou Santoro and Mike Lowery created INFORM

Inform

Over the following decade, version 6 became reasonably stable and a popular language for writing interactive fiction. In 2006, Nelson released Inform 7 , a completely new language based on principles of natural language and a new set of tools based around a book-publishing metaphor.- Z-Machine and...

 for the newly formed time-sharing

Time-sharing

Time-sharing is the sharing of a computing resource among many users by means of multiprogramming and multi-tasking. Its introduction in the 1960s, and emergence as the prominent model of computing in the 1970s, represents a major technological shift in the history of computing.By allowing a large...

 company Standard Information Systems (SIS).