I want to write an app which can re-write the boot sector of an optical
disk. I can't find an API call for this, and have a {*filter*} suspicion that
I may need to make DOS calls.

Does anyone know how to do this?

Bill.

PS what's reckoned to be the best way to find the right API call for a
given task? Once I know the call, I find using it not too difficult, but
I have trouble finding what call I ought to be trying.