meaning of EVAL_BODY_TAG

[David Treves]

Hi, I have been trying to figure the meaning of the EVAL_BODY_TAG while reading the spec of JSP. I understood that it means to run over the body supplied by the tag. My question is, when the stream of content streams into the buffer (on the way to the client)? Is it EVERY time the body is evaluated THAN something is sent (piece by piece) to the buffer, or is it in one bundle when the doAfterBody is called?   Thanks for your time, David.