the first texture is a sphere map, its simulating the reflections the environment would cast on the object (see settings of their 2d mapping node)
some of these usually come with a 3d modeling tool like modo/cinema 4d etc. and they can be used with any object.
the second one is probably a lightmap for that specific object, its simulating the shadows the object would cast on itself and/or environment light situation.
this texture only works with one object, which has to have certain information in them how to 'wrap' the texture around the object.
have a look at
http://en.wikipedia.org/wiki/UV_mapping to get the basic idea.