You can use behaviors to determine which browser your visitors are using and to determine whether they have a particular plugin installed. For more information on behaviors, see Behaviors overview.
Check Browser sends visitors to different pages depending on their browser brands and versions. For example, you might want visitors to go to one page if they have Netscape Navigator 4.0 or later, to go to another page if they have Microsoft Internet Explorer 4.0 or later, and to stay on the current page if they have any other kind of browser. See Check Browser.
Check Plugin sends visitors to different pages depending on whether they have the specified plugin installed. For example, you might want visitors to go to one page if they have Shockwave and another page if they do not. See Check Plugin.