You can simply open Sql Server Managemant Studio and have a look at the tables. Of course, you will see the changes only when they are commited. so either the code in NAV has passed the actual trigger where the record is modified or you explicit call COMMIT();
If you never used sql server management you will notice that the tables are stored with the company nam e ahead.
For example the item ledger entry in demo database is:
[CRONUS AG$Item Ledger Entry]
and a select statement for reading all records in the table could be
SELECT * FROM [Demo Database NAV (7-0)].[dbo].[CRONUS AG$Item Ledger Entry]
Regards
Alex