I don't ever use mine (Logitech G5) because it not only has side-to-side actions, but many times when i try to middle click, the wheel will scroll. I know this is probably my own coordination, but I find I really have to press it perfectly perpendicularly. Maybe there have been improvements in middle-click technology in the past few years.

This is a (very much) known issue with most of the top-of-the-line Logitech mice.

"It means click the button in the middle"

If she can use a computer and browse the web, she can learn to use the mouse she owns.

[Note: props to your grandma]

Edit: Wait, maybe you're referring to a mouse that has the wheel but the wheel isn't a button? In that case, the GP could have said "right click, open image" rather than "middle click". Same thing.

Arh, but then she will forget how to left click and we will be back to square one.

I recently noticed that a surprising number of people around me don't know that middle click opens links in a new tab.

Most of them use the right click drop down option.

I always used Ctrl-Left Click

"What's a tab?"

"And have you seen my medication?"

I also have a scroll wheel, but that scroll wheel is clickable