your words are a great encouragement to me!
i am embarrassed by my English and i will improve it.
maybe i missed something that makes you a little misunderstand in point 3.
what i want is data-copys between databases automatically processed by
program. and databases may be not in the same host. i feel that this is hard
to implement now. so i'll try 1 and 2 in [HACKERS].
thanks for you advice.