MDAC 2.5 SDK - ODBC Programmer's Reference
Chapter 18: Installing ODBC Components
The installer DLL maintains information in the registry about each installed ODBC component. On computers running Microsoft® Windows NT® and Microsoft Windows® 95/98, this information is stored in subkeys under the following key in the registry:
HKEY_LOCAL_MACHINE
SOFTWARE
ODBC
Odbcinst.ini
Because Odbcinst.ini is a subkey of the HKEY_LOCAL_MACHINE tree, the information about ODBC components is available to all users of the machine. For information about the registry, see the Platform SDK documentation and the release notes for the ODBC component of the MDAC SDK.