While Parallels Desktop software provides the appropriate environment within MacOS, you, as the user, will need to supply the guest operating system. The Parallels software will need to be activated by the entry of a 30-character activation code. Unlike the MacOS software, which forms part of the standard Mac computer hardware purchase, in my case a MacBook Air unit, the Parallels software does require an additional download and purchase on a subscription basis. The wall-gardened aspect of the Apple software means the reverse is not possible but we live in hope. This software allows users to run Windows on a Mac device. The Parallels solution, now up to version 13, is currently available as Parallels Desktop Pro Edition.
That is until Parallels came along with a solution that would allow Windows to operate on a Mac-based environment running the wall-gardened MacOS software. Put them in the same environment and you might expect conflicts to occur as they battled for dominance. Windows and MacOS are two computer operating systems that you could hardly call the “best of friends”.