While I find this second uv-map thing pretty cool, I was always wondering how to let models react in a simple way to the shadow on the terrain or model, whatsoever.

While taking a quick look in the wiki I stumbled across the following shader:
http://www.coniserver.net/wiki/index.php/Texture_projector

It's a texture projector, which seems to project the texture of a model on another model depending on the projector's position.

Now I asked myself if it is possible to use that shader to project the shadow map of the terrain/entity on to (e.g.) the player entity?
Has anyone ever tried to link thoses things?