EMACS question

[mclure@sri-prism]

    I am attempting to ascertain what exactly EMACS does with a vt100
(or vt100 simulator such as the Macintosh which is what I am on) in
order to implement line insert/delete with the vt100 "mung window"
features.

    Is there someone out there who can tell me what exactly EMACS
(or TECO) does in order to implement this line insert/delete feature.

    Thank-you.

	Stuart