Intego Content Barrier X4 sets up a protective wall around your computer. Its predefined categories let you choose what you don't want your children to see, and you can also create your own custom categories. Blocks adult web sites, sites with subjects not fit for children, and even blocks chats when predatory language is used. It blocks all offensive content coming from the Internet. Content Barrier X4 works with multiple users, and interfaces seamlessly with the Mac OS X user accounts on your computer. If you have several children, you can set different criteria corresponding to their age or maturity. You can choose whether they have access to newsgroups, e-mail, or whether they can download files. You can set the program to let them only use the Internet at certain times, and on certain days. You can choose to block or allow specific web sites, allow users only to use selected applications, and block access to specific types of content, such as streaming media or peer-to-peer file transfers. The program can even send you e-mail, automatically, when certain events occur.