It depends on what you mean by "using". Most routers have the ability to prevent groups of users from accessing Internet-based programs and services. This feature goes by different names including, Port Filtering, Access Control, Outbound Firewall Access rules, and others. But they all allow you to block Internet access to things like Web browsing, file transfers, mail, newsgroups, etc. by blocking the port used by the application for particular IP addresses that you program. The Port Filtering feature, however, does not prevent users from connecting to each other through the router's switch for File and Print sharing services. All it does is block access to the Internet-based services that you specify.