Separate names with a comma.
I think this may be a feature of Lion that is enabled by default. Go to System Preferences and General. You will see the following option enabled...
You can also change or add a key mapping in the Preferences. Default key mapping for Ctrl+Alt+Delete is Ctrl+Alt+Insert
Using Parallels Desktop 7 on Mac. I would like to see warnings about hardware configuration settings of the vm that would not be compatible...