how does envmap work?

i looked at all the tutorials, like this:
http://www.blender.org/documentation/htmlI/x4881.html
http://de.wikibooks.org/wiki/Blender_Dokumentation:_Environment_Maps
and iv even looked at examples, is there a video tutorial?
thanks

bump: plz help

bump: plz help

blender game engine doesent use envmap! this is only on render!
game engine has Sec Map , NormalMap, and there is others…but not envmap!

thanks…

u can fake the environment mapping with a HDRI and set it to ref in map input activate CSP
col .5 this would work but hell WE NEED real Sphere Mapping support for the game engine :))) bring this on the todo list…

used it on my scene