The most vulnerable part of MDC is Nexis, its business information arm, which is essentially an electronic warehouse for other companies' information.
They tend to be entrepreneurs like William F. Gorog, retiring president of the Magazine Publishers Association and founder of the company that developed the widely used Nexis and Lexis electronic information-retrieval systems.
The Nexis disk is the first to appear in a consumer magazine, but it is just the latest twist in marketing everything from insurance to help-wanted ads via computer disks.