Doubble Glazing?

hi dude's and dudet's

i had a customer come in with a 2002 745i i noticed that the glass has double glazing.
i'm just wondering is there any do's and don't's with double glazed windows,
do there have a double glazed b-g
and is there any issue's doing a heat shrink with double glazed b-g's

thanks mike

bump

ive never had a problem with them

dont heat the doors. rear is fine, well you shouldnt have to heat the rear except for shrinking

hey guys thanks for the replies yeah i knew there was an issue with heating double glazed glass just couldn't remember if that was all.