\hsize = 210 true mm \vsize = 297 true mm \begingroup \hoffset = 1.0

true in \voffset = 1.0 true in \global \advance \hsize by -2

\hoffset \global \advance \vsize by -2 \voffset \endgroup



\message {\hsize: \the \hsize} \dimen 0 = 0.013837 \hsize  \message

{\hsize: \the \dimen 0 [IN]}



\centerline {Hallo world}

\end