Playing DOS Games or Running Old Software

Running old software on a computer can be done for a variety of reasons.  For example, comparing a current software to an old software (Windows 10 to Windows 95 or Word 2016 to Word 6.0).  A help desk can run multiple operating systems and software versions to help supporting users who have different software.  An old game may have caught the eye of a player and they want a nostalgic experience or a new one. In any of these cases the application may simply not run on the current version of