Well, we used lots of PDP-10's in the timesharing (oops, marketing calls it REMOTE COMPUTING) business in the '70's and '80's. By the late '80's this business was dying fast. But it was fun. Yes, Compuserve was a big player. I worked with ADP Network Services (originally Cypernetics Corporation); we had quite a few PDP-10's. (about 25). Also, we probably had 100 - 200 PDP8's and PDP-11's as network nodes. When DEC released its KS10 processor (minicomputer architecture), we ported TOPS-10 to run on it. We ran about 75 or 100 of these as dedicated mini's for individual clients. As I recall DEC only sold the KS10 with TOPS-20. For better or worse this machine was superceded by the VAX. What were these users doing? Mostly interactive management applications - financial models (think of Fortran meets Excel); stock analysis; engineering analysis; statistical analysis & forecasting. It really was "personal computing". Regards, Brad remembering those good old days...