Separate names with a comma.
Check here : http://forum.parallels.com/showthread.php?287726-Parallels-in-OSX-10-9-host&p=688976&viewfull=1#post688976
Here's something I worked out earlier for Parallels 8 Desktop. ...... So, Parallels 8 doesn't run natively under Mavericks, as it doesn't seem...