BA remote for AU

[S3SR]

ok i searched and found nothing of relevance

anyways im curious because a mate has about 3 BA remotes, all mine are stuffed...and he said i can have them if i can get them to work.

i can understand that the AU system would be comepletely different from the BA one, but is it just a matter of copying the code on the AU remote and flashing the BA one?

is it that it cant be done and its been tried or just not worth the hassles?
i only ask is that the BA remote seems a little mroe sturdier and better looking and smaller than the AU one.......

if not then ill just keep using my key....

also anyway of changing the unlock thing without a remote, ie unlock all 4 doors at once?