ProxySettingsPerUser
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2
HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings
Stores configuration data for the policy setting Make proxy settings per-machine (rather than per-user).
To change the value of this entry, use the Group Policy Object Editor (Gpedit.msc). The corresponding policy is located in \Windows Components\Internet Explorer.