texinfo: @need

Breaks

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15.10 '@need MILS': Prevent Page Breaks
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A line containing only '@need N' starts a new page in a printed manual
if fewer than N mils (thousandths of an inch) remain on the current
page.  Do not use braces around the argument N.  The '@need' command has
no effect on other output formats since they are not paginated.

  This paragraph is preceded by an '@need' command that tells TeX to
start a new page if fewer than 800 mils (eight-tenths inch) remain on
the page.  It looks like this:

     @need 800
     This paragraph is preceded by ...

  The '@need' command is useful for preventing orphans: single lines at
the bottoms of printed pages.