What alternatives are there to multiboot?
Various solutions exist for running non-native software in a host operating system. Wine permits most Windows® software to run under Linux. Odin permits most older Windows® software to run under OS/2. Various applications permit Windows® software to be run on a Mac. Parallels, VMWare, VirtualBox, Microsoft Virtual PC and others permit an entire operating system and its native software to be installed as an application under a host OS. KVM switches permit sharing keyboard, mouse and display among one or more computers, and there are a lot of perfectly usable old computers around not being used. Many companies that periodically upgrade have trouble finding ways to get rid of old systems without sending them to landfills.