Registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
Parameter: ProxyEnable
Type: string
Description:
Set the value of the 'ProxyEnable' string parameter to '1' to enable proxy or to '0' to disable it.

Registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
Parameter: ProxyServer
Type: string
Description:
This key contains default proxy server parameters. You can change 'ProxyServer' to a value of server name and port combination. For example: proxy.gtu.edu:8080

Registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
Parameter: ProxyOverride
Type: string
Description:
Fill the string value 'ProxyOverride' by a list of domain names you'd like to skip from going through the proxy. Use to mask any internal addresses.