Yes.

1. You can include several applications in a single VE project and browse them side by side simultaneously.
2. You can create one project per application and open several sessions of Visual Expert at the same time (1 session per project)
3. You can include 1 set of PBLs with your ancestor libraries + multiple applications using it (sets of PBLs inheriting from the ancestors PBLs) : more details on this page
4. You can include 1 PB application + 1 database called by the PB application : more details on this page