What is the function of the tapetum layer?

Question

What is the function of the tapetum layer?

Answer 1

...and as a 3rd totally different definition for Tape-tum:

http://www.myspace.com/tapetum

Answer 2

Tapetum is the inner layer of the anther lobe. This gives the nourishment to the developing pollen grains inside the anthers.

Answer 3

An area in the pigmented layer of the choroid coat of the eye in many animals, which has an iridescent or metallic luster and helps to make the eye visible in the dark.