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6.1 Invisible comments

@z...@x
If a source or include file begins with ‘@z’ (in the very first two characters of the file), then all material is skipped until and including a line beginning in column 1 with ‘@x’ [except that lines of the form ‘$Keyword: text of keyword $ are processed; see $KEYWORD, ATK_ (source files), or ATk (include files)].
@%
All material until and including the next newline is completely ignored.
@%%
As ‘@%’, but also skip blank lines that immediately follow the current line.

For example,

     @z
     Author:  J. A. Krommes
     @x
     @c @% This sets the global language to C.
     @* EXAMPLE.