Re: How do I set header and footer width independently of body text width?

[Jeffrey Howard Kingston]

There is no easy way to do this.  The code that lays out pages may be
found in file LOUTLIB/include/dsf, but the assumption that running
headers extend across the same space as body text is buried quite
deeply in that code, from memory.  Still, there is nothing to stop
you changing  @SysInclude { dsf } to @Include { mydsf } in your
book setup file, and hacking away at mydsf to get what you want.

If you do do this the most viable approach might be to leave the
page layout alone, but hack the format of running header printing
so that their leftmost part is overstruck with nothing, something
like this from memory:

   def @MakeAppearFurtherLeft right x
   {
      @OneCol { |1io x }
   }

and then enclose whatever the current format is in this symbol.
The idea is to make the running headers poke into the left
margin without the higher-level code realizing that it is.

Jeff