A:AnswerI don't know of any desktops that use a stylus. Maybe there are. Unless it's made to use a stylusyou have no option. There's nothing made to work with it. If the desktop didn't have a stylus when you bought it my answer is SOL.
A:AnswerActually this is from Samsung website:
EJ-PT820BBEGUJ
S Pen
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Compatible with Galaxy Book/ Tab S3/ all Note Phones / Note Pro Tablets / Tab A 9.7 with S pen / Tab A 10.1 with S pen
Air Commands provides short cuts to key note taking functions