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Sorry that I wasn' clear enough.
I try to get a less command. So I want only to enter

\documentclass[a4paper]{article}
\usepackage{amsmath}
\newenvironment{test}{\gather\boxed}{\endgather}

\begin{document}
\begin{test}
123
\end{test}
\end{document}

to get this result

\documentclass[a4paper ...

Hi,

\newenvironment{test}{\gather\boxed}{\endgather}
It does not border the full argument only the first letter ...

example:
\documentclass[a4paper]{article}
\usepackage{amsmath}
\newenvironment{test}{\gather\boxed}{\endgather}

\begin{document}
\begin{test}
123
\end{test}
\end{document ...

You have to replace Acrobat OpenDoc-Find.edt and Acrobat OpenDoc.edt with the new versions (download them here: http://www.winedt.org/temp/).