bpc_send semantics and per-channel application-specific data?

I noticed that buffers are generally copied before calling bpc_send().  
Why is this necessary, and are there circumstances under which it may be 
omitted?

I also need to keep some information that is per-channel and per-message 
that is application-specific.  Is there any preexisting clean place to put 
such things, or do I need to make and maintain my own data structures for 
both?

William and Darren, thanks again for your previous help.

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-- David C. Niemi           Adeptech Systems, Inc.   --
-- Reston, Virginia, USA    http://www.adeptech.com/ --
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