Where to find the CS4 API ?

Hi,

I'm looking for all the available documents about CS4 server, especially the current API (aka scripting reference, as it was called in CS2).

I have also never been able to find it for CS3 (I only succeeded to get it for CS2).

Does someone know a URL or place where I could find it ?

Our company is a partner and owns a CS4 server license, but up to now, it didn't help to find the docs.

Thanks !