Dear List, please help me with my problem here .... I - probably naively - tried the following: ------------------------ \starttext \def\Buffer#1#2 { \startbuffer[#1] \input #2 \stopbuffer } \Buffer{bla}{knuth} \stoptext ------------------------- Context gives me the following error on this: tex error > tex error on line 9 in file C:/Users/emargraf/Documents/buffer.tex: ! Undefined control sequence \Buffer ...startbuffer [#1] \input #2 \stopbuffer l.9 \Buffer{bla}{knuth} ----------------------- Kind regards Erik