Recital 10.0 introduced the SET DATADIR TO [<directory>] command.. The full syntax is;

SET DATADIR TO [ <directory> ] 

This command is used to specify a  directory where database tables, memos, indexes, and dictionary  files are located. When a table is being opened this directory is searched first before the current directory and the file search path to locate the table and its associated files. This allows the database tables to be relocated to a different file system without the need to change an existing application.