原來是Parallels Desktop有新的Beta版了（Build 1862）
USB improvements - easily use multi interfaced and isochronous USB devices (including Windows Mobile 2005 and webcams).
Mac OS X performance improvements - optimize Mac OS X or guest OS performance by switching off the Mac cache function.
Graphic performance improvements - enjoy faster, smoother video playback.
Keyboard support improvements - use all of the keys on your Mac keyboard, such as the eject CD button, right-left and Shift/Ctrl/Alt (option)/Windows keys, in any virtual machine.
Unicode path support improvements - name files and paths in national languages.
Shared folders performance improvements - open folders and files faster, and transfer data across OSes smoother.
Other fixes and improvements