Control tokens like \4 in CWEB

[Daniel Wyckoff]

Dear Texhax,
I see code like @t\4@> a lot in mf.web and elsewhere, and seem to recall it has something to do with inlining code or something.  The CWEB manual doesn't tell me much, and I was wondering what \1-\9 do and what a control token is?

Thanks,
-Daniel B. Wyckoff

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