Project sharing allows you to set up a project so that several people can work…
Vectorworks Tip 331 – Project files and Working Files
The concept behind project sharing is that there is one Project file, but eveyone that wants to work on the project has a working file. The data is stored in the Project file and the working file, but the data is only sent to the Project File when you Save and Commit the changes. Until then, the changes are only kept in the Working File.