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+% 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 27.6.4, p. III-435.
+% Original source in file "macros7.TEX", starting line 1860.
+\wlog{L: "be-env.tip" ["macros7.TEX," l. 1860, p. III-435]}%
+% This file DOES belong to format "texip."
+\InputD{namedef.tip}
+\InputD{compst.tip}
+\catcode`\@ = 11
+\def\NewEnvironment #1{%
+ \wlog{\string\NewEnvironment: new environment #1.}%
+ \NameNewDef{@@B-#1}{%
+ \bgroup
+ \def\@CurEnvName{#1}%
+ \NameUse{@Begin#1}%
+ }%
+ \NameNewDef{@@E-#1}{%
+ \NameUse{@End#1}%
+ \if\StringsEqualConditional{#1}{\@CurEnvName}%
+ \else
+ \errmessage{Ending environment: mismatch in
+ environment names: specified: #1,
+ expected: \@CurEnvName}%
+ \fi
+ \egroup
+ }%
+}
+\def\B #1{%
+ \NameUse{@@B-#1}%
+}
+\def\E #1{%
+ \NameUse{@@E-#1}%
+}
+\catcode`\@ = 12