Most network drivers are included in the Linux kernel. However, some types of network cards may require separate installation of drivers from the manufacturer. In this case, pay special attention to the list of officially supported operating systems and warranty terms. Also pay attention to how the network equipment is managed: some switch models require installation of special programs that do not work with all OS versions, or installation of browser plug-ins that may also not work with all OSes. For example, at the time of writing, there is no Oracle Java plug-in for 64-bit Linux variants, and the open source version of the IcedTea plug-in does not work with all products.