[peteri]

Interesting mention of Sidekick Plus, there was a complete SDK for it which I don't think ever got released anywhere (I had a copy as I was working for Borland at the time). It allowed multiple documents to be open at the same time.

[3x35r22m4u]

It allowed to copy text from screen and paste into its editor, had a modem terminal app, contact app and a calculator. It was a joy to use!