AdSystemInfo - if it on your 9x box (which I suspect it isnt) would be located here in the registry:HKEY_CLASSES_ROOT\ADSystemInfo
wintendo needs to have the ADSI runtimes for Win9x installed before you can do any of this AD magic (free from MS) ...
If memory serves, when I did try to install the ADSI runtimes for NT - the ADSystemInfo object still didn't get installed properly (everything else did) ... so just a heads-up on that.
ADSystemInfo was a tough nut to crack. For some reason, it isn't documented in the ADSI SDK and I remember having to do alot of web searching and forum hunting to find it (for use in our original InOU() functions posted in the beta forum) ... I think it might be a little like the ADSecurity.dll that ships as part of the ADSI reskit - included in Windows 2K but requires special handling for NT and 9x ... not sure on that - things might have changed since then.
-Shawn