databases are database-handles which have been configured in the Configuration
Manager and which can be used in all commands that use handles. When,
for instance, you select a preset-database handle in the OpenDatabase
command you don't need to setup all properties of that database, because
these have already been configured in the setup of the preset-database.
When using a preset-database handle in the QueryDatabase
command you can run realtime queries on the database and get information
about tables and columns which can be used to create the queries.