Host changing....compression issues/question

[Qvae]

you can ask Zen Cart to do it itself by setting GZip Compression to 1 under Admin->Configuration->GZip Compression.

1/ Maybe a dumb question, but would that enable it site wide, or just for zen?

2/ If I read the link you pointed to me correctly, all web compression basically leads back to gzip through calling something. So do I still have gzip function through php? If that is the case, why did the host say "gzip isn't something that we install any longer" and "we no longer install mod_gzip,"?

Or am I just confusing something?

Thanks.