What is wordmaster?

Some articles on wordmaster:

Seymour I. Rubinstein - Business Ventures
... Rubinstein had Barnaby totally rewrite NED into a new product, WordMaster ... launched in September, 1978 using Barnaby’s first two programs, WordMaster and SuperSort ... "So while WordMaster, SuperSort, and WordStar were developed on IMSAIs (I used mine til I got an IBM PC), few customers used them." -- Rob Barnaby in email to Mike Petrie 2 May 2000 ...