Windows is far from being the only game in town.The Apple Mac's secure and stable OS X operating system has a fiercely loyal band of devotees, and the user-friendliness of Linux distros has persuaded many people to take advantage of a seemingly endless supply of free software.Until now, the problem has been sharing resources between the operating systems, and both Linux and OS X are traditionally seen as isolated from Windows for this reason. However, this is no longer the case. Read on to find out how to configure Linux, OS X and Windows to freely share each other's resources, and in some cases, even log into each other.