@w{text}: Prevent Line Breaks
@w{text} outputs text and prohibits line breaks
within text.
You can use the @w command to prevent TeX from automatically
hyphenating a long name or phrase that accidentally falls near the end
of a line.
You can copy GNU software from @w{@file{prep.ai.mit.edu}}.
produces
You can copy GNU software from `prep.ai.mit.edu'.
Caution: Do not write an
@refillcommand at the end of a paragraph containing an@wcommand; it will cause the paragraph to be refilled and may thereby negate the effect of the@wcommand.
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