% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 4.5.5, p. I-98.
% Original source in file "reg2.TEX", starting line 987.
\wlog{L: "swapbox.tip" ["reg2.TEX," l. 987, p. I-98]}%
% This file DOES belong to format "texip."
\catcode`\@ = 11
\newbox\@SwapBox
\def\SwapBoxRegs #1#2{% 
    \setbox\@SwapBox = \box#1% 
    \setbox#1 = \box#2% 
    \setbox#2 = \box\@SwapBox
}
\catcode`\@ = 12