>WordStar had different hotkeys (which were adopted by many other programs due to WordStar being the #1 word processing program in the IBM PC's infancy). I don't remember the details, it's been 20 years or more since I used it, but there was some logic to the hotkeys. The letters were related to the action performed and were reasonably easy to remember. WordPerfect's were more or less random.

Wordstar was my code editor under CP/M :).

Since its basic keyboard was a VT52 emulation, it didn't have much use for function keys (of which there were only four), nor did it know about Alt key (which didn't exist on VT52), so anything it needed to do would be ctrl+something. Ctrl+K was a prefix for any clipboard command - and it had quite a few, including copying rectangular chunks of text, saving clipboard to a file, loading a file into the selected region.

We kept using it for a number of years, until we switched to Windows.