Oh, I found a way:
1. First check which rc process it is (check id with ps). Can be tricky, luckily it was the first rc after starting rio.
2. ns id and check to which rio.name.number /mnt/wsys $digit it is attached
3. Once you have rio.name.number and $digit, in the remote drawterm instance you can just
mount /srv/rio.name.number /n/wsys $digit
and
cat /n/wsys/text
4. Happy!
Info taken from:
Knowing how to plug the mounted namespace screen to a current screen would be interesting, too.
Thanks,
Ruben