When you load a project into AutoCAD, all the public subroutines, also called macros, become available for use. Projects embedded in a drawing are loaded whenever the drawing is opened. Projects stored in DVB files must be loaded explicitly.
Anytime a project is loaded, any other projects that are referenced by the first project will be loaded automatically. Additionally, AutoCAD will automatically load at startup any project file with the name acad.dvb.
You can also load a project file using one of the following methods: