I use Snipping Tool - on Apple pcs, it goes by some other name.
On Tim's mac, it's called "screenshot" - but he doesn't have the paid version, so when he clicks on the pen, nothing happens. At work, he has "Snag It."
The tool bar in Snipping Tool shows icons for save, copy, mark with a pen, or mark with a highlighter.
i can't find one to add typed words. I can't write words with that pen....