WordStar: A Writer's Word Processor (1996)
sfwriter.com
sfwriter.com
In particular, Borland's IDEs supported both a clipboard and the WordStar "block" commands, which gave you selection superpowers. A block was a selection that persisted even if you moved the cursor around, and even if you copied or pasted stuff in/out of the clipboard. So you could copy something to clipboard (ctrl+ins), move/copy a block around (^KB to begin block, ^KK to end it, ^KC to copy current block to cursor, ^KV to move it), and then paste from the clipboard (shift+ins). It was very much like having two clipboards. I had colleagues watching over my shoulder trying to decipher how I was able to edit code the way I did.