Apple Logic Pro /LogicExpress Discussion

> > And I hate to be a stickler - but computer history
> > is Important to me!
> 
> Please stickle.. wrong information should be corrected :o)

I've always worked in a Windows environment and have had the luxury of 
a nice stable environment since I use outboard recording and mixing but 
my reason for the primative question has everything to do with 
upgrading in the very near future.  I'm not a programmer but have 
become very capable with Windows just because that's where I've been 
for all these years. When I expand my studio I'm gonna want to upgrade 
any and all software. Since I see no other software that compares to 
Logic, I have to familiarize myself with the Mac system. 

My question about UNIX was trying to see if all the different operating 
system names were just different versions through the evolution or if 
there have actually been different base operating systems and if 
certain names refer to certain operating systems. It's a very basic 
question but I'm totally unfamiliar with Mac and  I'm just trying to 
find a place to plant my feet.
Thanks for the info,
Gary