• /etc/odbc.ini = Datasources
• /etc/odbcinst.ini = Drivers
• /usr/lib/unixODBC/ = ODBC setups amoungst many other libraries
• /usr/bin/DataManager = Gui database table/field browser
• /usr/bin/ODBCConfig = lovely GUI DSN configuration tool
• /usr/bin/isql = terminal program for testing DSNs

unixODBC was originally setup with the freeTDS driver to allow connections to the SQL Server on zeus, and remove the barrier for porting STS to linux.

Warning!: updates to unixODBC have a nasty way of overwriting the configuration (they do keep a backup). Anyway to stop this from happening the files in /etc/unixODBC have been made read only. Chances are you will need to add write permissions (using chmod) before using ODBCConfig - and ofcourse you want to remove write permission when you've finished ;-).