This is from a posting that has a lot of info about background web tracking. Read closely the last part about listings which will still show up on the adobe's Website Storage Settings Panel site even after cleaning:
Flash stores shared objects in this folder:
C:\Documents and Settings\user_name\Application Data\Macromedia\Flash Player\#SharedObjects\
Flash stores site-specific Flash cookies in this folder:
C:\Documents and Settings\user_name\Application Data\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\
Flash stores global settings and previously-visted websites having Flash cookies in this file:
C:\Documents and Settings\user_name\Application Data\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\settings.sol
BetterPrivacy has an option labeled "Also auto-delete Flashplayer default cookie (settings.sol)" that refers to this file. If the user enables this option, then Flash global settings are deleted too and revert to defaults. I prefer not to use default global settings, which ask the user's permission for potentially dangerous actions, because I share my PC with an inexperienced user. By not deleting the default cookie, the user will see previously-visited websites in the Website Storage Settings Panel. But notice that there is no storage used for each after BetterPrivacy deletes the Flash cookies.
I haven't checked out if this is the case but the author seemed to know his/her stuff. This info came from here:
http://forums.comodo.com/other-security-products/automatically-blockdelete-super-cookies-t39123.0.html;wap2=