ftp.nice.ch/pub/next/graphics/3d/geomview.1.4.1.s.tar.gz#/Geomview/src/bin/example/callbacks.c

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/* We include the C code generated by the forms designer (fdesign2). */
#include "panel.c"

extern float dt;

/* This is the callback procedure we must write. It's the interface
   between our program and the forms code.
 */

void VelocityProc(FL_OBJECT *obj, long val)
{
  dt = fl_get_slider_value(obj);
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.