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From: Pierre VINET <vinp@globetrotter.net>
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Subject: Re: Runtime graphics
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> \externalfigure[\MPrunfile{1}]
> 
> since you need the prefix

This does not work either.
But digging almost everywhere in ConTeXt, I finally found the macro
\executeMETAPOST{myfile.mp} in supp-mps.tex who drive the command
  
  mpost -progname=mpost -mem=metafun myfile.mp

and do the right job for me.

\executeMETAPOST can be used as many times you want, on the contrary of the
set \startMPrun ... \stopMPrun .

-- pv