Changes

This is a slightly low-level command to grab user input and store it in a buffer. It is different from {{cmd|startbuffer|[X]..\stopbuffer}} because it allows one to use custom buffer start and end stringscommands, instead of \{{cmd|startbuffer|[X]...\stopbuffer}}. Use this command by defining the desired buffer start command to invoke {{cmd|grabbufferdata}}. One might think that if the buffer start command calls {{cmd|grabbufferdata}}, the latter does not need to know the former. This is an understandable thought, but in the case of buffer nesting the information is still required.