Michael,
You have to create two parameters, called tokens, like 'DocKey@' and 'ObjectID@'. I'm not 100% certain how this would work with a stored procedure though, but you should be able to add a formula within the Record Selection of the report to something like {StoredProcedure.DocKey} = {?DocKey@}. Refer to this thread for more information and you can always search the rest of the SCN and Google as well. This thread contains a list of Object IDs.
Message was edited by: Thomas Gough for embarrassing spelling errors.