Using hint priority to monitor parking lot slots

I had read that hint could be used to monitor the state of virtual devices i.e.
exten => 123,hint,meetme:123

I have been searching but cannot find a way to do this with parked calls. Does anyone have any experience with this?

SO just in case anyone else is trying to do this:

MeetMe device state is supported in Asterisk 1.4.X. Monitoring parking slots is also available in 1.4.X using the syntax… exten => 1234,hint,park:701@parkedcalls.

Thanks to Russell Bryant for the information!