[tex-k] METAFONTk and MetaPostk, and -parse-first-line

[Thomas Esser]

> Many of us have been aware of the  %& first line feature for some
> years.   This last exchange prompts me to ask the question: 
> where is this feature documented, and  where is the entry in the 
> texmf.cnf file documented, (if any ?) 

Documentation of the %& feature:
  web2c manual, chapter 3.5

Documentation of texmf.cnf variable parse_first_line:
  ??? Maybe, the file texmf.cnf itself is the documentation for some
      of the possible settings!?

Maybe

Thomas