Capturing a screenshot can show someone exactly what you’re seeing on your screen. Here’s how to do that, whether you want to capture your whole screen or just part of it.

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Do you see what I’m seeing? Probably not. But capturing a screenshot can show someone—tech support, your BFF—exactly what incredible thing you’re seeing on your screen, whether it’s an error message that is driving you to tears or your ex’s new flame on Facebook.

Here’s a step-by-step guide to all of the screenshots you’re likely to need on a Mac. When you take one, it’s saved as a .png file on the desktop, with the nomenclature: “Screen Shot date at time.png.” You can opt to save your shots to the Clipboard instead by following the instructions below and then adding Control to any of the key combinations.

You can open your screenshots with Preview, Safari, and apps that let you edit or view images. And of course you can attach or embed them in emails and iMessages.