Additional Longhorn features include buddy matchmaking, parental controls to limit access to games based on title or ESRB rating, and patch support that works like the Windows Update service. This feature will be useful to game developers, because informing users when a new patch is released is often a headache, and, with the possible exception of Valve's Steam, developers haven't found a good way to either notify gamers of patches or efficiently deliver updates. The patch support in Longhorn allows developers to specify a download location for executable patches in their games, so the game will automatically check for patches at regular intervals. Users will have a choice between automatic download and installation or manual approval of each patch.