Anyone know how to enable Ingres DB function in PHP on a Win2k system

[TimGoogler]

Do I have to enable a DLL extension in the php.ini file.
I can't tell which one it is & the instructions on PHP.net
isn't too helpful.
I know Ingres support is only experimental but not sure if
I've even got the DLL's.
I'm using PHP 4.3.3
Ingres II

This is what's in my PHP.ini file...

;extension=php_ iconv.dll
;extension=php_ ifx.dll
;extension=php_ iisfunc.dll
;extension=php_ imap.dll
;extension=php_ interbase.dll

Help appreciated.
TT