WordPerfect
Videos
WordPerfect (WP) is a word processing application, now owned by Alludo, with a long history on multiple personal computer platforms. At the height of its popularity in the 1980s and early 1990s, it was the dominant player in the word processor market, displacing the prior market leader WordStar.
At its peak, WordPerfect Corporation occupied this seven-building campus in Orem, Utah, at the foothills of the Wasatch Range.
The WordPerfect headquarters building, seen years later
WordPerfect for DOS box, next to storage boxes for 3½-inch diskettes
The Reveal Codes feature in WordPerfect
Spell checker
Videos
In software, a spell checker is a software feature that checks for misspellings in a text. Spell-checking features are often embedded in software or services, such as a word processor, email client, electronic dictionary, or search engine.
Google Chrome spell checker in action for the above poem, the word "chequer" marked as unrecognized word