\unprotect

% for tugboat

\mutable\protected\def\acro#1{\dontleavehmode{\smallcaps#1}} % can be redefined

\definebtxcommand\hbox   {\hbox}
\definebtxcommand\vbox   {\vbox}
\definebtxcommand\llap   {\llap}
\definebtxcommand\rlap   {\rlap}
\definebtxcommand\url  #1{\hyphenatedurl{#1}}
\definebtxcommand\acro #1{\dontleavehmode{\smallcaps#1}}

\mutable\let\<< % for now \mutable, maybe \definebtxcommand\<{<}
\mutable\let\>> % for now \mutable, maybe \definebtxcommand\>{>}

\protect \endinput