Valdocs
VALDOCS is an obsolete Pseudo-GUI WYSIWYG framework/OS for valuable document creation and managemant, written in Forth and shipped with the Epson QX-10 microcomputer circa late 1982 (to beta testers).
Included in Valdocs is a WYSIWYG word processor (with keyboard macros and multiple screen formats), spreadsheet, database and communication module, as well as a desktop manager with an address book, mailing list manager, notepad, calculator and more.
You could switch from one program to another by just pressing an associated hotkey.
The descriptions of the Mac, prior to Apple's trip to Parc remind me of Valdocs.