operating system

I would like to share my views on using a tool called VM ware.Virtual machine ware is nothing but a software tool in which we can use several operating systems on one base i.e if your pc has windows vista,you can install VM ware in which you can us the list of operating systems like

->Sun solaris
->Linux distributions
->hp unix,etc

With the help of this VM ware we can go for any operating systems,since these operating systems cannot be used by us until we purchase the hardware from that manufacturer.VM ware helps us to to work with these having your own type of system.
I hope you people would give a try for this.