ELT
===

syntax: (elt <sequence> <index>)

        ==> <element>

This function returns an element of a list. It ob-
serves the fill pointer in vectors, which have fill
pointers. The index starts with 0!
This function is not supported by babylon v3!

example:       >(setq computer '("cpu" "ram"
                                 "harddisk" "floppy"))
               ("cpu" "ram" "harddisk" "floppy")
               >(elt computer 2)
               "harddisk"