OK, so I was browsing the Opera Docs and came across this
http://www.opera.com/support/mastering/kiosk/#switchesIf you take Opera.exe and then add /K /kioskbuttons to the end, it will create a Kiosk like web browser with limited access to the users system, but Ctrl+Alt+Del in XP is still accessible, there is a workaround
[*]Is there nothing this 13MB application won't do? I am very very impressed with Opera 10.50 as a browser and in general as a company!
Also seems Opera6.ini is now operaprefs.ini, looks as though they have tidied up the file structure but not the documentation.
Even though they don't publicise it, it appears their intentions since V10.00 is to create a browser that can work as a standalone application and installed. They have an option to enforce use for a
CD (haven't tested!) This is why my confusion between Opera@USB V9.64 and Opera@USB V10.00 started because V9.64 was a wrapper and the other wasn't, Opera@USB V10.00 .EXE had the same MD5 signature as the installed Opera .EXE. I literally couldn't understand the change until I did a bit more research on the past versions. I knew Opera V10.00 was a radical structure change, but didn't know it was that much of a difference!
So it seems that when Opera@USB took off, Opera sat back and thought perhaps we should re-design the browser to suit both users (changelogs don't show when.) With changes to the cache being written to the Profile (freakazoid, I understand what you mean, I tested Opera@USB V9.64! and it wrote the cache to the %TEMP% folder) and use of a simple file structure, goes to show they care about Portable Software more than we thought

Personally I think Opera should host an official ZIP version on their site, for those who appreciate Portable Software. It might even help them win the "Browser War."
If they could only change that registry key! Lets hope they're watching
Disclaimer: I am not affiliated with
Opera Software ASA.