I use Parallels since there is this virtual machine. Each new version was a highlight. Jetz I have upgraded to Version 6 and am already excited. But now times factually. I have different. Windows versions on my Mac running (WIN-XP-Prof. (Vista) is no longer and now Windows7) and of several installations for my special programs that focus when you all next to each other on the same machine would be there, would not prepare as problems. This is due primarily to Windows as well as on the programs themselves (I only mention STEP7 with all the attendant modules). In the new version 6 am particularly impressed the "Windows pause when no programs are running." This means you do not have the VM connect to resources for the MAC again to get free. Suffice it to shut the windows or programs and after a short time the VM goes into a kind of sleep mode. Once you any etws of it we will immediately wake up again. I could go on raving. But try it yourself. "Parallels is it". WOSCHNA