> Without trying to complicate the discussion, I used
> 
>       .\"
> 
> Not
>       \#
> 
> The former is a pure comment. It does not enter into any processing.

This is not correct.  The escape `\"' strips everything to the end of
the line but *not* the final newline.  Consequently,

  .\"

is equivalent to

  .<newline>

A leading dot without a following macro name is an undefined request
that gets ignored.

On the other hand, `\#' ignores everything to the end of the line
*including* the final newline.  This means that e.g.

  Test
  \# foo
  Test

produces

  Test Test

as expected.  It's a matter of taste whether you are going to use
`.\"' or `\#' for full-line comments.


    Werner

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