It is now obsolete, use a skysphere or skybox instead.
MAKE OBJECT SPHERE 1, 10000
TEXTURE OBJECT 1, 1 : Rem 1 is a sky texture or something
SET OBJECT CULL 1, 0
POSITION OBJECT 1, Camera Position X(), Camera Position Y(), Camera Position Z()
Basically, always keep the sphere's center at the position of the camera so that it is always stationary. This snippet can be revised of course but it is the way used now for texturing your backdrop.
EDIT: Oops, I missed that bit, sorry for the assumption
"Man who looses key to woman's appartment...... He get no nookie" - A wise chinese man.