[NTG-context] Two questions about buffers

Hello, I have two questions concerning buffers. 1. What is the difference between \grabbufferdata and \dostartbuffer? 2. I wanted to use buffers to define my own "environment" (as Wolfgang suggested to me a few days ago). However, there's a problem with \baselineskip; here is an example: \starttext \def\startMyEnv{\dostartbuffer[MyEnv][startMyEnv][stopMyEnv]} \def\stopMyEnv{{\tfxx\getbuffer[MyEnv]\par}} \input tufte \startMyEnv \input knuth \stopMyEnv \input tufte \stoptext Am I doing something wrong here? TIA -- Marcin Borkowski http://mbork.pl