eweb, trex, literate programming, other doc tools

[luc.taesch@REDACTED]

i was toying around with eweb and trex.

1) the eweb package has no eweb.erl, but a eweb.jam. where can i get this 
eweb.erl ?

2) any feedback on literate programming around? 

3) is trex like tv ? why another one ?
from

http://www.erlang.org/user.html

4) what is the documentation standard in ericsson ? any specific tool?

thks

Luc