It should be piossible to work out what COS looks for
from the source
listings. I am not sure, though, if the version on
vt100.net is recent
enough to support this. It's a pity nobody has the COS 3.4 or COS 4.0
listings.
I cannot find the COS listings in there at all. I must have missed
a manual somewhere. I'll traipse up into the attic in the next day
or two and see if I can find the right box.
Antonio