Installing ODBC Router on Windows

Step 1: Download and install ODBC Router

click Start->Run
enter http://odbcrouter.com/m/ORSETUP_EVAL.EXE
follow default prompts until installation completes

Step 2: Create your DSNs

open the ODBC Data Sources administrative control panel
click the System DSN property tab
click ADD if you don't see the Data Source Name of the database you want
pick the ODBC driver for your database brand/version (don't pick iODBC.NET or OverDriver)
complete the Setup Dialog hit any TEST button to confirm ODBC connection

Now, any DSN list in your System DSN property tab extend to your client-computers.

Next:
Configuring PHP for ODBC on Linux
Configuring PHP for ODBC on Macintosh & XServe
Configuring PHP for ODBC on Windows
PHP and ODBC