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All FWEB commands begin with the character ‘@’. It is recommended that these begin in column 1 if possible. This is required in some cases [e.g., the ‘@x’, ‘@y’, and ‘@z’ in change files (see Change files), or column-oriented FORTRAN-77 processing].
Some of these control codes may be used anywhere; others begin a new part of the current section. (For a discussion of sections and parts, see The structure of a web.) For a quick summary of the control-code mappings and to see which codes begin new parts, say ‘ftangle -@’. See ‘-@’: Display the control-code mappings.