During the late 1980's, WordPerfect was THE standard word processor for DOS based PCs in big business. Under DOS, it competed mostly against Wordstar. WordPerfect for Windows enjoyed some success in the early Windows environments, but was quickly displaced by Microsoft Word for Windows. Later Windows versions were part of Borland Office/Novell PerfectOffice/Corel Office/Corel WordPerfect Office.
During the WordPerfect 4.1 time span, Satellite Software International changed their name to WordPerfect Corporation.
Wanted: WordPerfect 4.0 disk dumps.
Wanted: WordPerfect 4.0 for Victor 9000 (seen on eBay)
Note: Reportedly educational versions of WP 4.0 are copy protected.