Sessions

The VX data hierarchy allows root objects such as parts, assemblies, sketches, drawing packets, and CAM plans associated with a design to be stored in a single manageable object file.  VX utilizes a data management concept called sessions.  The active session is a temporary work area into which portions of VX object files are loaded as needed during a design or revision.  

The session concept allows large complex parts and assemblies to be worked on as efficiently as the simplest part.  You can view and manipulate the entire design while only the objects and entities being edited are retrieved thus requiring less system resources.
 

When you create a new file it resides in the active session and contains the initial root objects that you create.  When you save the file or save all files for the first time, they are moved from the active session to a permanent directory that you specify.

When you open a file, the active session only retrieves the root objects and sub-objects needed.  Also, display information is loaded on-demand.  Display information that lies outside the initial view window, that is blanked, or that isn't needed for the active display mode (e.g., facets for shading) is not loaded.  This is all transparent to you the user.  When you save a file or save all files, the files are updated and then the session is cleared of those files.