User-Agent information within Store implementation

Hi,

Is there any way I can get the "user-agent" information of the request
within my Data Store implementation.  I couldn't find a way where this
information is passed in to the store implementation. I want to extend
the data store to use our own repository and would like to handle files
from certain clients in a special way.... and would like to get the
client information at this point... Any suggestion?

Any help would be greatly appreciated.

Thanks

Sheeba Padmanabhan