Disable the local connection can access it later?

RT, I saw some people can actually use, why

it's up to you whether or not there is only one local connection, if There are two, one of the disabled, the other can not access the Internet unless there is a wireless network and wireless network card or computer is the IE cache files, there can not, unless there are a number of local connections, may be installed on many occasions Drive the formation of dual-card may, but is prohibited activities are not the only Internet connection may be used for broadband dial-up Internet