How to hit "right-control" in VirtualBox on a remote Linux system over RDP via CoRD? I'm connecting using CoRD to a remote Linux system running xrdp.  On that Linux system, I'm running VirtualBox.  To escape from Virtualbox, I need to hit a "right control" key.  Trouble is... I don't know how.

Anyone have experience with this kind of arrangement?  Suggestions?
I was able to reprogram the VirtualBox Host Key.  It seems to think my right-command key is a left alt, but the end result is the same, it works now.