Am looking for example of a resource manager that hooks file opens and closes to keep track of client applications 
(keeps some per-application context, besides of "subclassing"  OCBs ).

From existing samples in the SDP and reference, this is possible, but I'm stumped and cannot figure out how to do this 
correctly.

Can  _msg_info.scoid always be used to identify client apps?

Another question: if I do not create a thread pool for a resource manager, will my callbacks always run in single thread
, in FIFO order? Or it can still create a thread pool implicitly?

Any pointers, please?

- s.