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Let VNC viewers connect to currently logged in user Network
Want to connect with the currently logged in user when using a VNC viewer rather than seeing the Login Window (ARD 3.5/OS X 10.7 and later)?

sudo defaults write /Library/Preferences/com.apple.RemoteManagement VNCAlwaysStartOnConsole -bool true
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Pinch and zoom the cover art album browser in the Music app iOS devices
When you turn your iOS 7 device to landscape (horizontal) mode in the Music app, you get a lovely grid of album cover art from the music in your library. You can tap on one to see that album in details.

But you may not realize just how interactive that grid is. You can swipe across it to drag other album covers into view. But even better, you can pinch and zoom to change how many album covers fit onto the screen at a time.
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Let Siri give a random number iOS devices
Siri can returna random number, letter, or word.

After reading Lex's hint about rolling the dice and flipping a coin, I decided to see whether Siri can generate random numbers. It can have Wolfram do it. You can speak "random number" (which it interprets as "random integer"), "random integer", or "random real". You can also specify ranges, such as "random number between ten and 100" or "random real between 20 and 30".

"Random word" and "random letter" also work.
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Roll the dice or flip a coin with Siri iOS devices
Over at Finer Things, David Chartier points out that Siri can help you play games of chance. Unfortunately, however, the virtual assistant can't necessarily help you win at said games. Still, you can use Siri when you need to flip a coin or roll a pair of dice.

Say "Flip a coin," and Siri will either announce that it's heads or tails. Ask Siri to "roll the dice," and you'll get a pair of numbers between one and six. You can't ask Siri to roll a single die. Or rather, you can, but you'll still get two numbers back.

Hardcore role playing game enthusiasts will need a separate app or actual dice hardware to roll dice with more than six sides; Siri's apparently not into D&D.
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Use TextEdit in native Full Screen mode Apps
Do you love TextEdit for its simplicity and elegance? Have you ever thought that it'd be great to use it in full screen mode? Here's how to achieve that. Apple has released TextEdit's source code as an example of an Xcode project; with Xcode installed, you'll be able to manufacture a version of TextEdit with full screen support.

Open TextEdit.xcodeproj and on the left, find the Interfaces folder and select the file DocumentWindow. Then, select the window; make sure you select the window itself and not one of the objects contained in it. On the right, you can see the different inspectors Xcode provides. You'll want to select the fourth, the Attributes inspector. There are a lot of changeable attributes of the window available, but what we're interested in is the full screen support. Change that to "Primary Window". Build and run the application. Presto, you have full screen support!

To get the finished, executable application, locate "TextEdit.app" in the folder "products", right click on it and "Show in Finder". You can move or copy it to a place of your choice - you might wanna keep the original TextEdit application, just to be safe though.
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Make Do Not Disturb on iOS 7 work even when your device is awake iOS devices
iOS 6 introduced Do Not Disturb, but some of us were annoyed by its implementation: Though the feature silenced iOS notification sounds while your iPhone or iPad were sleeping, those noises still blasted out when the device was in use. If that's not what you want to have happen, iOS 7 has the solution.

Armed with this hint, Do Not Disturb will empower you to use your iOS device in a room with sleeping people, or in a meeting where you're supposed to be paying attention, without fear that a bleep or bloop will bother those around you.

Head over to the Settings app, and tap on Do Not Disturb. Scroll down to the bottom of the screen, and set Silence to Always, instead of Only While iPhone Is Locked. From now on, Do Not Disturb works regardless of whether your iPhone is awake and in use, whenever the mode is enabled.
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Make Messages on iOS 7 show full names iOS devices
iOS 7's new design seemed to cause some spacing issues in Messages, especially on the iPhone. Where you formerly could see the full names of the people you texted, iOS 7 shows only a first name, or perhaps a first name and last initial. When you know as many Dans as I do—even as many Dan M.'s as I do—that just won't do.

There's a fix, though the setting isn't where you might expect.

In the Settings app, tap on Mail, Contacts, Calendars. and then scroll way down to the Contacts section. Under that header, tap on Short Name. For my purposes, I turned off both Short Name and Prefer Nicknames. Now, Messages shows the full names of the contacts I'm sending messages to, shortening the button labels at the top as necessary to make everything fit.
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Use Siri to adjust your iOS device's brightness iOS devices
In iOS 7, Siri can toggle a lot of settings: Bluetooth, Airplane Mode, Wi-Fi, and more. And the virtual assistant also gives quick access to more granular settings.

Tell Siri something like, "Change the brightness," and the brightness slider will appear onscreen, ready for you to adjust. Of course, you could always simply drag up Control Center instead, but who doesn't like a virtual minion to do their brightness-adjusting bidding?
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See cellular data usage by app in iOS 7 iOS devices
One powerful new feature in the Settings app lets you see how much data your apps are using over your iPhone's cellular connection. You can even block specific apps from accessing data over your cellular connection if you prefer, limiting them to Wi-Fi-based data access only.

To find the options, launch Settings, and tap on Cellular.

Scroll down past all the Personal Hotspot, Call Time, Cellular Data Usage, and other options, and you'll get to a Use Cellular Data For section.

The list is sorted alphabetically, unfortunately, and not by cellular data consumption. But you can see how much data each app has used over your iPhone's cellular connection, and use the green slider to disable certain apps from using cellular data at all.

You can tap on System Services to see how much cellular data is used by system components that you can't prevent from using the cellular connection, like DNS services, Time & Location, Siri, mapping, networking, and such.

You can reset the statistics with a button at the very bottom of the screen.
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Remove old events from Calendar Apps
Ever wanted to remove all events prior to a given date from your calendar? Well, there's a script for that. This Applescript prompts you for a pivot date and removes all events prior to this date from your Calendar database.

display dialog "Please set the pivot date. (Events earlier than the pivot date will be deleted.)" default answer "01-01-2010" with icon note
set dateLimit to (date the (text returned of the result))
display dialog "This might take a few minutes." giving up after 2

tell application "Calendar"
    set cals to every calendar whose writable is true
    set r to {}
    repeat with c in cals
        set event_list to every event in c
        repeat with e in event_list
            if start date of e is less than dateLimit then
                set r to r & {e} 
            end if
        end repeat
    end repeat
    if the number of items in r > 1 then
		display dialog "Nothing to delete."
    else
        display dialog "Done. Found " & (number of items in r) & " events with a date before " & dateLimit & ". Shall I delete them?"
        repeat with e in r
            delete e
        end repeat
        display dialog "Done." buttons {"OK"} default button 1
    end if
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