Parametrized Graphics in Mathematica (Martin Kraus)
  Demo: Parametrized Graphics in LiveGraphics3D

  An example with DEPENDENT_VARIABLES:
 
<HTML>
<APPLET 
  ARCHIVE="live.jar" 
  CODE="Live.class" 
  WIDTH=400 HEIGHT=400>
<PARAM 
  NAME="INDEPENDENT_VARIABLES"
  VALUE="{x->3,y->-2,z->1}">
<PARAM 
  NAME="DEPENDENT_VARIABLES"
  VALUE="{mx->x/2,my->y/2,
    mz->z/2}">
<PARAM 
  NAME="INPUT"
  VALUE="Graphics3D[{
    Line[{{0,0,0},{x,y,z}}],
    PointSize[0.08],
    Point[{x,y,z}],
    PointSize[0.04],
    Point[{mx,my,mz}]}]">
</APPLET>
</HTML>