[NTG-context] \startlines in mark IV

Hi, I setup this test: %%%%%%%%%%%%%%% \starttext \startlines \input test.tex \stoplines \stoptext %%%%%%%%%%%%%%% File 'test.tex' contains just a 'Hello world!' line. This test goes okay when I use 'texexec' from default Ubuntu package. When I use 'context' from minimals, I get a message that ends with: ! Undefined control sequence. l.3 \input test.tex If I remove lines '\startlines' and \stoplines' from the test, I get no errors. What did I do wrong? Did '\startlines' changed in Mark IV? Thanks, Maurício