Quick question

Looking at the contents of a mac hd, how can you tell if the system had os 9 or os 10?

One thing I thought of was to look for safari and it it was not there then most likely it didn't have os x, did even the first version of os x have safari though? Is there a better way to tell?

 

What about the system folder?

I thought I remember that os 9 had a system folder or is that what you are getting at?

I tried looking for a user folder and did not find it, so I think that this computer did in fact have os 9 would that be a correct assumption?