can a person run mac on a windows sys. or only run windows on a mac

If you use windows, you can run os x (cracked version) within a program called vmware.

If you use os x, you can run windows within a program called parallels.

HTH

you can also run either inside linux using vmware

you can run all systems on all systems if i'm not mistaking

Macretails right but some of them could be illegal or not yet defined (running OSX on Windows or Linux).
BTW is the OSX86 work illegal. Are you allowed to run OSX on a x86 computer as long as you have bought the OS