Dynamic shadows and reflections

Hello, Currently my 3d engine uses pregenerated lightmaps for the world geometry. While it looks pretty good just moving around the world, it looks kind of funny when an object moves around and doesn''t cast a shadow. I''ve done a little reading the last few days, and it seems that many people are creating dynamic shadows (and reflections) with the use of a stencil buffer. None of the sample programs seem to work on my machine though, so I''m assuming that the stencil buffer isn''t supported by my video card. (It''s a Voodoo 3. Anybody know for sure if it doesn''t support stencil buffers?) Onto my question: What''s a good way to implement dynamic shadows and reflections? (I''m currently using OpenGL, if that matters.) Thanks for any pointers, Jesse Chounard