One of the most perplexing things about Microsoft Windows (any version) is that sometimes you need to click once, and sometimes you need to click twice (aka double-clicking). By this point in my life, the difference between the two is hard-wired into my DNA, and I don’t have to think about it. However when training new computer users how to use Windows, I’m at a loss as to how to explain what the difference is. How does once describe situations in which a double-click is required vs. situations where a single-click is required (esp. without using the work invoke)?
Perhaps the only honest advice I could find online to this question is on this University of Michigan website: If a single click does not work, try a double-click.
There’s an attempt at a fuller explanation on the geekgirl.talk website. It’s about 1,200 words long.
Comments
Once single-clicking becomes a habit, you’ll see that not only there’ll be less clicking noise, but also, less mouse-work.
Single-clicking is easier on the hand, and less tiring, especially if you work long hours at the computer.
When browsing online, single clicks are the standard.
Try double-clicking on the send / submit button twice…
So why not adopt single-clicking when working offline as well?
Double clickers work almost twice as much with their mouse compared to single-clickers.
Double clickers waste their time clicking.
Have you noticed that double clickers are often impatient?
It’s up to you, ultimately.
Brought to you by a determined single-clicker.
I am 
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