Put text onto top bar/header

Today I was trying out Anchorhead, and I noticed something while I was playing.
The author was able to put text into where the location is displayed (top bar/header I think). Out of curiosity, how would I be able to do this in Inform 7 (This version of Anchorhead was made in Inform 6, but it should still be possible maybe).

I haven’t messed with this myself but looks like this is the relevant bit of the docs.


With apologies if I’ve missed the point but extension Basic Screen Effects by Emily short has some options for messing with the Status bar.

While you have, that is good to know for whatever purpose.