I had only used my Atari 800, Apple II,DOS PCs and Macs in the 1980's. In 1991 I went to a new high school and we had a VAX running VMS. I was amazed that hun

I had only used my Atari 800, Apple II,DOS PCs and Macs in the 1980's. In 1991 I went to a new high school and we had a VAX running VMS. I was amazed that hundreds of users could be logged into the same machine all doing their own thing. A buggy program could crash with no threat to any other program you ran or any other user running their programs. Sending email and phone / chat messages was really cool. Then I found the Unix SunOS and AIX systems and liked them far more. I learned that multi user systems went back decades but at the time I didn't really know and felt like something very powerful was lost going to these small personal computers with so many memory and operating system limitations. Of course learning about the vast price differences quickly made me realize why.