Good Day

HELP-ME again my friends!!
how to improve this script to:
define a default desktop!!
I read about kix detec office, but dont understand very well
and if the computer use openoffice( some workstations have it, YES OPEN SOURCE), the kix detect?
how t define a default wallpaper? i read about screensaver, but nothing about wallpaper
and to make icons? of office and openoffice??
TKS MY FRIENDS!!