Apple has issued an update to OS X Mountain Lion Developer Preview 3. The new build comes as 12A193i and is available through Software Update, which in turn downloads through the Mac App Store, making the update available to all developers with OS X Mountain Lion DP3 currently installed.

Noticeable changes in the new OS X 10.8 build are to Mission Control, Messages, System Preferences, Notifications Center, iCloud integration, and Preview app, but otherwise there do not appear to be significant differences in the Developer Preview 3.1 update. Of course, many bug fixes and resolutions to issues identified in the previous build have also been included, and an update to XCode 4.4 Developer Preview 4 was released alongside the update to build applications for the latest developer release.

OS X Mountain Lion is scheduled to be released to the public in late summer of 2012 and is expected to have more stringent system requirements than OS X Lion.

Full Screen apps in Mac OS X are managed by Mission Control, this means that if switch beween or gesture swipe from one full screen app to a desktop or another app, it follows the order of desktops and apps shown at the top of Mission Control.

This also means that you can rearrange the placement of fullscreened apps easily.

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If you’ve ever tried to do web research with concurrent browser windows from the iPad, you’ve probably found yourself either opening tons of Safari tabs, emailing yourself lots of links, dumping things into Pocket or a similar app, or just giving up and getting on a Mac laptop. A better solution is an iOS app called Dual Browser, which as you may have guessed splits the browser window so you can view two web pages at the same time, side by side.

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Each time you connect an iPhone, iPad, or iPod to a computer, iTunes launches and immediately begins to automatically sync all content between the iOS device and the connected computer.

If you’re annoyed with the auto-syncing aspect of iTunes, or you just want to disable it on an auxiliary Mac or Windows computer, here is how to do so.

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Did you take a great picture with your iPhone, but your iPhone camera orientation was upside-down or sideways? This happens pretty often, and if you ever need to correct the orientation of an image by rotating or flipping a photo, you can easily do so right on your iPhone, iPad, or iPod touch.

The image rotation and flipping tools are built directly into the Photos app of iOS, thus there is no need to download additional software for this simple image editing purpose. Here is how to easily correct and rotate a photo directly on iPhone or iPad:

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Do you want to join a group of songs together in iTunes to play together as a compilation even when iTunes on a Mac or Windows PC (or an iPhone, iPad, or iPod) is set to shuffle through a music collection?

For example, let’s say you have a large album you want to shuffle between, but you don’t want to shuffle other songs in iTunes.

That’s easy to accomplish in iTunes on Mac or PC, here is how to set this up:

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Whenever a new Terminal window is launched, a variety of system logs are read to provide information on the last login. One way to speed up launching a new terminal window is to delete those .asl log files, but you can achieve a substantial speed boost by simply setting Terminal to open a shell rather than /usr/bin/login. This is achieved through the same means of changing the shell and is just a few quick steps within Terminal settings.

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Firefox is a great web browser but it has a few quirks that make it a less than ideal browser for OS X Lion and Mountain Lion users. A major issue is scrolling performance, which can stutter or appear slow and clunky, it’s noticeable enough that certainly anyone who has used Firefox in Mac OS X has experienced it before. Here’s the strange part, it’s completely remedied with a preference setting that is buried away:

• Open Preferences from the Firefox menu
• Click on “Advanced” and under ‘General’ check the box next to “Use smooth scrolling”

Now try scrolling up or down in a lengthy browser window to experience the perfectly smooth scrolling that is standard in other web browsers, the difference is night and day.

The big question of course is this: why on earth isn’t this enabled by default in Firefox? With smooth scrolling enabled, Firefox does use slightly more CPU only when scrolling pages, but it’s certainly not egregious enough to warrant disabling by default except perhaps on the oldest of Macs with limited resources.

Anyway, enjoy your newly improved Firefox browser and don’t miss some other Firefox tips. Heads up to ZeroDistraction for pointing out this little fluke.

Using sysctl we can get extended information on a Macs processor, covering everything from CPU brand and identifier, clock speed, number of cores, thread count, thermal sensor data, cache size, and some significantly more technical information.

This is a handy way to get detailed processor specs and info without turning to the system profiler in Mac OS X, as the entire task is handled from the command line.

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It seems like all Mac users these days have an iPhone or iPad to compliment their setups, and this weeks Mac setup shot from Andreas H has the best of all worlds. Hardware shown is:

• iMac 27″ (Mid 2010) – wallpaper is here
• MacBook Air 13″ (Mid 2011)
• iPhone 4S, black, 32 GB
• iPad (3rd Gen) 32 GB Wifi+4G
• Apple Bluetooth Keyboard
• Apple Magic Trackpad

Outside of the picture is an Apple Magic Mouse, an old PowerBook G4 12″ from 2003, an Apple TV2, two AirPort Extremes, two AirPort Express, and assorted other peripherals.

Want your Mac setup featured? Send pictures of Apple & Mac setups to osxdailycom@gmail.com and include some brief hardware details and what you use it for.

You probably know that tapping once on the screen within the Camera app will cause the iPhone to automatically focus and adjust exposure to that region in the viewfinder, but if you’re trying to take a picture with challenging lighting or depth conditions the auto adjustments are not always ideal.

Instead, use the excellent focus and exposure lock feature to get the exact lighting and focus you want out of a picture. The feature is quite literal, as you can point to a specific lighting or depth, lock it, then reorient the camera to the desired picture while maintaining the previously locked lighting conditions. Here’s how to use this awesome feature:

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Login Items are applications and helpers that launch immediately when a user logs in to Mac OS X. These apps and utilities are easily adjusted and managed in system preferences on a user level, but you can also temporarily disable them on a per-boot and per-login basis if need be.

To stop the automatic login items in OS X on a temporary per-boot basis, you need to use a keystroke modifier at just the right time. This is slightly different depending on the status of password protection on the Mac, but the basic idea is the same.

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iPhoto for iOS has a great feature that lets you wirelessly beam pictures from one iOS device to another, this means that if you’re editing a photo on an iPad you can immediately send it over to an iPhone and vice versa, without ever leaving the app.

1. Launch iPhoto on both iOS devices
2. Tap the gear icon in the lower right corner and tap to turn on Wireless Beaming
3. Now tap the photo or picture album that you want to beam, tap the arrow icon at the top of the screen, and choose “Beam”
4. Confirm the pictures to wirelessly beam, then tap the recipient iOS device and tap “Beam Photos”
5. From the receiving iOS device, tap “Yes” to start receiving the beamed photos

You will need Location Services enabled to use beaming with iPhoto, this is usually on by default but can be turned on quickly through general iOS Settings > Location Services.

iPhoto isn’t the only way to move pictures between iOS devices though, with iCloud enabled and Photo Stream, pictures taken on one device will appear automatically on each device using the same iCloud account, and pictures can also be sent through iMessage or a group of photos can be sent with email. The latter two options also work to send pictures between iOS and OS X, though preferably a future version of iPhoto for Mac will include the same beam option.

If you don’t have it, iPhoto is $5 on the App Store and comes as a universal app, meaning the same version will run on all compatible iOS devices.

If you’ve opened the sim card tray on a newer iPhone, you’ve probably noticed the card is considerably smaller than an average sim, these tiny cards are known as a micro SIM. The smaller SIM format is gaining traction but there are still tons of cell providers and phones that use the regular sized SIM card, including T-Mobile, many prepaid plans. and pay-go plans that you’ll find both at home and abroad. Now, obviously that full sized sim isn’t going to fit into the micro tray, but guess what? You can cut it down to size and convert any standard SIM to a micro SIM.

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Mac OS X Lion introduced the file locking feature, which causes any files to automatically lock themselves after a period of time to prevent accidental edits from occurring. You’ve probably seen the resulting message lock before, informing you a file has been locked because recent changes haven’t been made. The time it takes for that automatic file locking to take effect can be adjusted:

1. Open System Preferences from and click on “Time Machine”
2. Click “Options”
3. Look for “Lock documents _ after last edit” and click the pull down menu, selecting a new time duration before the file is locked by OS X

2 weeks is the default which I find to be overly aggressive and I choose 1 month instead, but some users may want locking to take effect even quicker and Apple offers the extraordinarily quick “1 day” option for those who want the utmost in protection from accidental edits.

In the same settings panel you can also choose to disable file locking completely just by unchecking the checkbox, though that isn’t recommended for most users.

Modern versions of OS X allow you to share files securely with another individual without creating a new user account for them. Instead, authentication gets handled by the individuals Apple ID, and a separate password is set to allow that Apple ID to share files and folders on your Mac.

This can be preferable to creating a new user account if you only wish to share some files and you don’t want to provide a user with complete login access to the Mac. Additionally, it can be an easy way to allow a user with an already existing Apple ID and iCloud login to get quick network access to the Mac.

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The font size of mail messages can appear really small on the iPhone, iPad, and iPod touch screens, but the default setting can be adjusted and increased substantially if the text size just looks too small.

If you want to know how to change the font size of Mail on an iPhone and iPad, you’re in the right place. You can change the text size quite dramatically, so you will want to try a few different options out, and ultimately it will depend on the quality of your eyesight as to what you’re most comfortable with. I have fairly decent eyesight but wear corrective glasses, and find that increasing the size a little bit is enough for me. If the smaller sizes make you squint though, boost the text size considerably and the minimum displayed font size won’t ever be smaller than the setting you choose.

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Does your Mac feel like it takes forever to boot up when you turn it on? Does your Mac seemingly take forever to reboot? If your Mac is feeling sluggish when booting or starting up Mac OS X it’s probably a result of a few things.

This walkthrough will address how to speed up reboot and startup times by focusing on specific issues on a Mac, including tackling a bloated login item list, too many windows being restored, a super slow external drive that takes forever to be accessed, or even just the general hard disk speed. The good news is that most of these are very quick to fix, so follow along and you’ll be starting up a Mac quicker in no time at all.

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