OS/2 2.0 enables users to install multiple operating systems, such as DOS 3.3, 4.0, and 5.0; DRDOS 6.0; and OS/2 1.3, on the same computer on which OS/2 2.0 is installed. This ability to select from multiple operating systems makes it possible to use a single hardware configuration but run applications that require a specific operating system. The Boot Manager feature also enables businesses with large numbers of users migrating from one release to another to fully test the new environment while the old environment continues to be operational. Application developers also can take advantage of this feature.