can i run both OS (vista or xp and Leopard) on a mac?

For can i run both OS (vista or xp and Leopard) on a mac? try this:

• yes, their is an app you can download (i forgot what it is called) but yes you can download the app load windows and fully use windows and mac
  
• On any Mac with an Intel processor. Use Parallels or Fusion or Boot Camp in OS 10.5.
  
• Yes you can. In fact, I am currently running four OS's on my macbook (Leopard, Suse Linux, XP & Vista) . For that, you need a virtual machine software like VMWare Fusion or Parallels. You can simply install Windows using the VMWare and run Windows just like an additional software on a mac (in a window or full screen). VMWare & Parallels may cost around 79$
  
  The other free way is to install windows directly through the bootcamp feature in leopard. The only disadvantage is that you have to restart your computer every time you want to switch between two operating systems, which is kind of a hassle. Personally, I would highlighly recommend VMWare Fusion for its performace over Parallels and for the fact that you don't have to restart the Mac to run it.
  
• Yes. You need Mac OS X Leopard and a copy of Windows. It is VERY easy.