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#31
VMware is software that lets you load a different operating system on a virtual machine - a 'computer within a computer'. There's a paid version and a free one called VM player. You load the os from an iso as if you were doing it on a real machine. Its good for old Windows that won't run on modern hardware - for Win95 I specified single core cpu and 64MB ram.
I've got the full set -
VMware Virtualization for Desktop & Server, Application, Public & Hybrid Clouds | VMware United Kingdom