$pwrp_db

This is the directory where the databases for all your local volumes will reside (including
the directory volume where the project is configured). Each database resides in it's own
sub-directory. This is valid if you choose to create your databases as BerkleyDB-databases.
If you instead choose to have mysql-databases the databases will be created on your
mysql-server.

In this directory the files for user-defined classes also reside, the UserClassVolumes.
They are text-files with file-end wb_load. The user-classvolume usually has a similar name
as the RootVolume in the project that uses the classes. If your RootVolume is named
VolMyProject then the ClassVolume will be named CVolMyProject and the name of the file
thus will be:

cvolmyproject.wb_load