Would it be possible to get a quick overview about how to use it? Looking through backend.cmod doesn't give much information. If I understand that well, Backend_struct is a transparent structure used in a generic way by backend.cmod - if it is so, where can I find specs about what does backend.cmod expect to find in the structure? I'd like to implement my own I/O backend and it seems that Backend_struct somehow makes it possible. How? :)

TIA