The ConTeXt manual tells me on page 237:

You can define your own buffer with:
\definebuffer[...]
... name
After this command /getbuffer and \typebuffer are available where buffer is the name of the buffer.

I do:
\definebuffer[left]
\startbuffer[left]
left\crlf
\stopbuffer
\typeleft
and it gives me the error:
! Undefined control sequence.
\typeleft ->\dodotypebuffer
                            [left][def-3]
l.92 \typeleft

then I try:
\typebuffer[left]

this gives a typeset message [file examdoc-def-2.tmp does not exist]
(file examdoc.tex being the containing tex file)

when I try
\getbuffer[left] or \getleft
nothing at all seems to happen?

Why doesn't it work according to the manual? 
Or do I misunderstand the manual completely?

Hans van der Meer