You can use dbase commands. But these are only applicable to the local cursors that you retrieve from the server via SQL commands. On these cursors they work just like any other dbf table (but they are temporary for the data session).

Basic steps:

1. Retrieve rows from backend DBMS via SQL into cursors
2. Perform updates on the cursors via dbase commands
3. Send the changes back to DBMS

There are a number of options for 1 and 3 -- you can use cursor adapters or SQL pass through.