Command to console into vcmp guest from host?

I know I have this somewhere in my notes, but can't find it (it's like trying to find something in a cluttered garage sometimes)...

What is the command to console into a vcmp guest from a host (for example, a 7200 chassis)?

This would be handy in the event an upgrade on a vcmp guest was taking longer than expected and I wanted to see what was going on, where it was in the boot process, etc.

Thanks!