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widget_control from call_external

Hello all,

  anybody have a hint on this?

  I have a c/c++ programme that is called from within a 
  widget hierachy via call_external.

  As the computations made take fairly long, I want to update 
  a status bar with a 'Percentage complete' from the C-routine,
  so the user doesn't get upset and thinks the programme died 
  on him/her.

  How do I go about that???

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