This sounds like a very simple question, but a simple search turns into a very time-intensive quest with more dead ends than you can imagine.
SPECIFICALLY, what I'm looking for is a desktop gizmo (freeware, obviously, if possible) that can be set to beep or set off a little alarm every five minutes from the time I designate for it to start.
Nothing complicated, nothing fancy, just exactly what I have described.
I'm going to set the points for this at the high end and award them to the first expert who comes through. For a couple of previous questions, I've received irrelevant answers and some that were way too complicated. Like the old joke says, if I ask you "what time is it?" don't tell me how to build a watch.