I love this stupid old thing. It's so clunky to use, but powerful for what it is. I do not have a manual so I'm just trying stuff, and I'm impressed.
In the screenshot above I'm using Notepad. I went into Calendar first, and selected the current month. Obviously it is Y2K compatible. There's a menu option to send the calendar page to Notepad, so I tried that. I opened Notepad and there was my calendar, ready for whatever editing I wanted to do. Everything is just text, so transferring stuff between programs is trivial. At any moment I can send all the contents of the screen to Notepad. In 1984 this must have been awesome.