I was borrowing my mum's Windows laptop once, and I didn't want to use the laptop keyboard so I plugged in my Apple keyboard and mouse. All went fine until I tried to control-click
Fortunately the internal trackpad has two buttons.
Related question: Back in the mid-90s, I had heard that the right mouse button was a 'shortcut button' to let you quickly get at common commands. How do you do an 'Arrange by Name' on the desktop icons without using the shortcut menu?
Or, for that matter, how do you open an item on the desktop? After all, a double-click is the shortcut for 'perform the default action'.