Constraining RTFM search by queue when updating ticket

We operate RT in 16 languages. I’ve set up a queue per language, and a
corresponding RTFM class with an identical name.

I’m passing the queue name into the RTFM BeforeMessageBox callback on

Looks like I’ll need to constrain the RTFM search by calling

Any hints on the appropriate parameters need to constrain searching for
RTFM_Content by particular named class?