Install iOS 6 beta on your devices

You're now ready to start installing betas on your devices. To do this, you'll need to use the newest version of iTunes which is 10.6.3 or you can do this through the xCode 4.5 developer preview. I recommend that developers use the xCode method while app testers are probably okay using the iTunes method unless the developer would prefer you to use xCode to submit feedback.

iTunes method

This time around there is no beta version of iTunes needed. Just make sure you're running the current version of iTunes which is 10.6.3. You can download it from Apple's website.

• iTunes 10.6.3 download

1. Open iTunes 10.6.3 after you've installed it and plug in the device you'd like to install iOS 6 beta to.
2. Choose your device from the left navigation pane. You'll see a Restore button. Hold down Alt+option (or Ctrl for PC users) and click Restore.
3. A file browser window will pop up. Navigate to the iOS 6 beta firmware file you would like to install onto your device.
4. iTunes will now begin to update your device to iOS 6 beta. Let it do its thing and you're pretty much done.

Xcode method

1. In XCode, under software version, you'll need to choose Other version.
2. Then xCode will ask you to navigate to the .ipsw file that you would like to install (the beta firmware file). I typically save them on my desktop or somewhere in a folder that I can easily find.
3. Select it and click Restore iPhone
4. A warning will pop up telling you all data will be erased. Agree and your device will be restored to the beta version. You can then restore from a backup in iTunes or from iCloud like you normally would.
Either update method will get you onto the beta. It's up to you to decide what method is most appropriate for your situation.

For more Check this.

Downgrade iOS 6 Beta to iOS 5.1.1

If you went ahead and installed iOS 6 beta and determined the buggy nature of the first developer release isn’t for you, it’s time to downgrade. Most developers should know how to do this already, but if not this process is easy and you’ll be back to running iOS 5.1.1 in no time at all.

Downgrading is identical on an iPhone, iPad, or iPod touch.

1. Turn the device off, connect it to the computer via USB, and launch iTunes
2. Place the iOS device into DFU mode: with the device off, hold down the Power and Home buttons together for 10 seconds then release the power button, continue holding Home button until iTunes notifies you of a device in recovery mode being detected. The devices screen should stay black as if turned off.
3. Restore within iTunes through either method a or b:
• a: Restore from the iOS 5.1.1 backup you made prior to installing iOS 6 beta
• b: Restore to iOS 5.1.1 IPSW by Option-Clicking the “Restore” button, and then restore from iCloud backup when finished
4. Let iTunes restore back to iOS 5.1.1, the device will reboot when finished

Typically you can’t downgrade iOS versions so easily, but because Apple is still signing iOS 5.1.1 this allows downgrading to commence with minimal effort.

How to run multiple skype account at the same time in one computer

To use more than one Skype account on the same computer at the same time you need to start a new instance of Skype. 

1. From the Windows taskbar, click Start > Run (or press the Windows and R keys on your keyboard at the same time) 
2. In the Run window, enter the following command (include the quotes) and press OK:
   "C:\Program Files\Skype\Phone\Skype.exe" /secondary 

If you get an error message, copy and paste the exact command from this page and try again.

Be aware that if you have changed the installation path for Skype then you will need to enter the correct path for the Skype.exe file.

If this solution fails, you can try another option: 

1. Find the Skype executable file (Skype.exe) in: C:\Program Files\Skype\Phone\ 
2. Right click on it and select Send to > Desktop (create shortcut) 
3. Locate the shortcut on the desktop, then right-click on it and select Properties 
4. In the Target field, add: /secondary. The Target field should now be "C:\Program Files\Skype\Phone\Skype.exe" /secondary 
5. Click OK. You can now start a new instance of Skype every time you double-click the new shortcut.