Connectix implemented tighter Mac OS integration features in Virtual PC by writing additional extensions for Windows. Version 1.0 had extremely rudimentary support (shared folder and basic clipboard). 2.0 brought along drag and drop as well as a bi-directional clipboard which supported graphics. The software essentially worked as a glue to make the integration work more seamlessly (it wasn't and as of 7.0, still isn't perfect but good enough). In the earlier days, it was simply called OS Additions and required manual installation but in later releases (including the Microsoft Mac versions), is the VPCAdditions disk image located inside the Resources folder of the application bundle. This is already installed in the various Windows OS packs but if you do an install from scratch, VPC will detect this when booting the new Windows install and throw up a dialog asking if you want to install those additions.
As far as I remember, I don't think there was ever any integration when installing Linux in Virtual PC for Mac (I only did it once myself around the VPC 5.0 timeframe) as the focus by Connectix and Microsoft (who in reality has not done much for the Mac version after they bought out the software) was always on seamless Finder/Windows Explorer drag and drop and better bi-directional copy/paste. Anyway, Parallels can eventually implement this feature and it will no doubt win browny points with current PPC Mac users who do utilize drag/drop between the Mac and VPC.
Last edited: Apr 24, 2006