User Agent String.Com 

User Agent String explained :

Opera 9.61
Opera	Name : Opera
9.61	Browser version
Macintosh	Platform
Intel Mac OS X	Operating System: OS X running on a Intel CPU
U	Security values: N for no security U for strong security I for weak security
de	Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) de = German
Presto	Layout engine for Opera
2.1.1	Version 2.1.1
Last visit:	2008.11.12 05:43
All Opera user agent strings