Parallels Desktop for Mac does NOT emulate the Intel processor required to run Windows and some other OSes. In an overly simplified way of saying, Parallels Desktop for Mac organizes things so Windows (or Linux) and Mac OS X, at the same time, share the same processor which is an Intel one, and virtualizes the remaining components of a common PC.
Building a software like Parallels Desktop for Mac so it would run on a PPC Mac is absolutely not a matter of building a Universal Binary version or not. It would require to emulate the Intel processor using the PPC processor, in addition to virtualize the architecture of a common PC.
Microsoft Virtual PC 7 is such a tool to emulate a PC on your PPC Mac. You don't need Parallels to redo the same again. I used Virtual PC 7 successfully before replacing my PPC Mac with an Intel Mac. It was of course much slower (processor emulation is a heavy task).
Last edited: Sep 19, 2007