Hmm .. how would I know if I'm using that?

By checking your source code to see if you disabled this feature, refer to the manual for how its enabled/disabled

And if so, why does it work fine on a 32 bit Apache and IIS6 system, but not the IIS6 x64 system?

Impossible to say, for all I know of IIS6, it could be an IIS6 feature

In reply to Re^3: IIS 6 x64 CGI variable problem by Anonymous Monk
in thread IIS 6 x64 CGI variable problem by karlk123

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