If you haven’t enabled Fast User Switching yet, you’ll have to do so first-it’s in the Login Options section of the Accounts System Preferences panel. To do that, I just chose Login Window from the Fast User Switching menu in the menubar. First, I had to get the login window on-screen.For instance, here’s how I captured the login window: You can also specify some of the command line arguments, as shown in the man page. Once you’ve used ssh to connect to the Mac whose screen you wish to capture, you need to execute the screencapture command with root privileges. While there’s not a ton of documentation on this program, man screencapture will give you the basic options. OS X includes a nice command-line screen capture utility named, simply enough, screencapture. So how’d I do it? The answer is simple, though it does require a second Mac with the ability to access the first Mac over a network. That’s a shot of the login window (in Fast User Switching mode) and a seemingly impossible picture to take. However, none of these tools will help you get certain screenshots, such as this one: Snapz Pro X to capture screenshots for nearly all of my magazine and Web site articles. MacUpdate, that will let you take a picture of your screen. Third party tools: There are a number of third-party programs, as seen on.This can be especially useful for programs (such as games) that sometimes disable the built-in keyboard shortcuts. Using the timer (Capture: Timed Screen), you can switch to a given program and then have the screen captured automatically. Grab: You’ll find this program in your Applications/Utilities folder, and it has one trick up its sleeve that the other methods don’t-it can take a timed screenshot.As above, add the Control key to force the image to the clipboard. It lets you take pictures of any particular window. Hit the Space Bar instead of dragging, and a small camera icon appears. Drag the cursor over any part of your screen to take a screenshot of that region. Shift-Command-4: This key combo makes a bulls-eye cursor appear.Add the Control key to force the image to go to the clipboard instead of to a file on your desktop. Shift-Command-3: This key combo lets you take a screenshot of everything on any attached displays.
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