\makeatletter \makeatother what do they do?

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Article #10351

#10351

From: Tas van.Ommen
Date: Tue, 18 Jun 1991 22:33

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Maybe this is a novice question but I can't find these control sequences
in either Knuth or Lamport.  What do the commands \makeatletter and      
\makeatother do?

Tas van Ommen                  email:  tas@physvax.phys.utas.edu.au

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!samsung!uunet!munnari.oz.au!diemen!tasman!tas
From: tas@tasman.cc.utas.edu.au (Tas van.Ommen)
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Subject: \makeatletter  \makeatother    what do they do?
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Date: 18 Jun 91 22:33:17 GMT
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