Start up mac using Internet Recovery Mode

Internet Recovery Mode is an Internet-based version of Recovery Mode found on newer Macs, which loads recovery tools from Apple’s servers. With Internet Recovery, you can reinstall OS X and troubleshoot issues in the unfortunate scenario of your Mac’s startup disk having become corrupted or completely unreadable.

How to enter Internet Recovery Mode
To enter this mode at any time, do the following:

1) In the Apple menu, choose Restart or power on your Mac.

2) As the computer restarts, hold down the Command (⌘) – Option (⌥) – R combination immediately upon hearing the startup chime.
Hold the keys until the animated globe appears on the screen. “Starting Internet Recovery,” the message reads. ”This may take a while.”
If you own a Mac notebook, make sure you’re using the built-in keyboard to enter Internet Recovery Mode as the keystroke may not register on external keyboards.

3) In the next step, a Wi-Fi menu appears. Internet Recovery needs an Internet connection to load the recovery tools from Apple’s servers. Click the menu to display the available Wi-Fi networks, and then select one to connect to.
If you’re connected to the Internet using Ethernet, you don’t have to connect to a Wi-Fi network during Internet Recovery.

4) If this isn’t an open Wi-Fi network, you’ll be asked to type in your password. Press Enter on the keyboard or click the checkmark symbol to continue.

5) After your Mac has connected to the Wi-Fi network, it’ll download a recovery system image from Apple’s servers and start from it, giving you access to the recovery tools.
Depending on your Internet connection, this may take anywhere from a couple of minutes to up to an hour, or longer. Connect your Mac to the power adapter so that it doesn’t run out of juice whilst it’s loading Internet Recovery from Apple’s servers.

6) If all goes well, you’ll be presented with the OS X Utilities window.
Choose the option you want to use in this window or via the Utilities menu.

The recovery tools let you reinstall the version of OS X which was factory-preloaded on your Mac, restore the computer from a Time Machine backup, check the connected disks for errors with Disk Utility or search for help online using Safari.


Change Hamachi network settings

Before opening Hamachi for the first time: (If you already opened it, install and uninstall it again)
1. Right Click on Network icon.
2. Open the "Network and Sharing center resources".
3. Click on "Change adapter settings".
4. Press Alt key to show hidden menu and click Advanced -> Advanced Settings.
5. Select Hamachi from list and press upper arrow until Hamachi is on top. Then select TCP/IPv4 for Hamachi list.
7. Right click in Hamachi and Select Properties -> Advanced. Uncheck Automatic metric and set Interface metric to 1.

Main source (pictures included):


CMD Solution

1. Open cmd as administrator and write
"netsh wlan show drivers”
If Host network permited is “Yes”, then you can do it. If not, you willnot be able to do it.
2. Write
"netsh wlan set hostednetwork mode=allow ssid=red1 key=123456789"
where 123456789 is the password of your network.
3. Initiate the network writing
"netsh wlan start hostednetwork"
4. If you do not get an error, you have finished. If you do, continue to step 5.
5. Go to
Device Manager > Network Adapter > Microsoft hosted virtual network adapter
and disable and reenable the Microsoft hosted virtual network adapter
6. Last step:
• Open Network Connections
• Give a right mouse click on the network icon with which we connect to the internet and choose "Properties".
• Open the Sharing tab.
• Check the box "Allow other network users to connect through the Internet connection."
• In the scrolling menu, choose the network created ad hoc.
• Click the "Settings" button and mark the protocols used.
• Save changes.

Main source (with pictures; Spanish webpage, but I guess google translate is enough to understand it):


Getting access to TUWien E-library ,E-books ,Papers

we know that if we are at university and we want to access and read E-books , papers we can simply connect with the student account to the university network and use E-library which university provide for us.but it's tedious and not possible,every time i want to read a E-book or a paper i should come to university to have access.there is also time that university is closed because of national holidays but i want to continue reading.

Web browsing on a PC is not as comfortable as on a Tablet

The introduction of Tablets has added new possiblities of how to browse through the web. Using a touch interface you can easily extend the user interface with intuitive gestures like panning or swipping. Why don't we have gestures on a common non-touch PC?

Powerlan adapters

One possibility is the usage of powerlan. Several companies like TP-Link, AVM, Devolo, etc. offer so called powerlan adapters, that use the grid of the flat or the house to establish a network for data transmission.
Concerning the hardware you need:

  • one adapter for the router
  • one adapter for each room from where you want to get access
  • one lan cable for the router
  • one lan cable for each room from where you want to get access

To establish the network you hava to:

  • stick the first adapter in a socket near the router and connect the two devices with a lan cable
  • press a button on the adapter (something like "pair" or "secure" or "connect")
  • now the adapter, that sends the signal over the grid, is aware of the router and forwards the information
  • for every room you want to have access from also stick an adapter in a socket in that room, click the button and connect your device with a lan cable
  • important: the lan-card of the device you are using (netbook) needs to be configured so that it gains the ip adress dynamically

That's it. The connection over the grid is of course secured. It depens on the producer how many bits they are using for the key.
Concerning the phases in your grid: If you need to send the signal from one phase to another, don't worry, many producers offer adapters that can handle this situation (they are just a little bit more expensive).


Using PowerLan to get access to the router (and the internet)

Imagine a flat where the router is located in the living room. Now you want to get access to the internet from the office room with your notebook via your router. But: <ul> <li>the office room is several meters and 2 rooms away</li> <li>the wlan signal can't get through the walls and </li> <li>you can't put an ethernet cable from the router all the way through your flat to the office room</li> </ul> How can you manage it to still get access to the internet via your router?

Using Adblocks


In fact I don’t know if Firefox was the first browser to support adblockers, But I know Firefox is what made adblocking popular.If you are a Firefox user and you want to block ads, look no further than AdBlock Plus. AdBlock Plus is a no-hassle, install-and-go adblocker add-on for Firefox. Really the only sort of “setup” you need to do with AdBlock Plus is select the adblocking filter you want to use. These filters are, more or less, a definitions list telling AdBlock Plus which ads to block

You need to select one of the filters to use unless you know what you are doing, just leave it at “EasyList” and click “Add subscription”. After the initial installation you can select to use more than one filter
(“Tools” -> “AdBlock Plus Preferences…” -> “Filters” -> “Add Filter Subscription…”)
Although AdBlock Plus blocks most ads on its own, if AdBlock Plus ever misses an ad you can right-click on the ad and select “AdBlock Plus: Block image”this will allow you to create a custom filter blocking that ad and ads similar to it:

Other useful features of AdBlock Plus are
• The ability to disable AdBlock Plus on specific websites . This can be done via the AdBlock Plus button:
• Adblocking is not a perfect science there will be false positives. AdBlock Plus makes it fairly easy to unblock images when these false positives do occur. This can be done by clicking the AdBlock Plus button, right-clicking the false positive, and disabling the corresponding filter

Internet Explorer

Block ads on Internet Explorer is a bit more complicated than Firefox because Internet Explore has no AdBlock Plus-like plugin. That is not to say Internet Explorer does not have adblocking plugins, but rather there is nothing for free as good as AdBlock Plus .

IE7Pro is a plugin for Internet Explorer (works on IE 6/7/8 – not just IE 7) that adds a boatload of useful features to Internet Explorer. One of the features IE7Pro adds is an adblocker. This adblocker, however, is not enabled by default after installing IE7Pro – users have to manually enable it after installation. (Be warned during the installation of IE7Pro you are prompted with – drum roll please – an ad for installing a third party program; don’t accidentally install that third party program if you don’t want it.):
After the adblocker module has been enabled, you still need to enable the Flash blocker (to block Flash ads). To do this, go to “Preferences” again, click on “Ad Blocker” and enable Flash blocker.You have the ability to modify filters, add your own filters, and whitelist websites.


Blocking ads in Chrome is just as easy as blocking ads in Firefox. In fact, AdBlock is easier to setup than AdBlock Plus; with AdBlock you do not need to select which filter’s list to subscribe to – AdBlock automatically uses AdBlock’s own filters and AdBlock Plus EasyList. So, to use AdBlock all you need to do is install it.
Most other features present in AdBlock Plus are in AdBlock:
• Users can exclude sites from being blocked (press Ctrl + Shift + L when surfing the website you want to exclude):
• Users can manually block an ad AdBlock missed (press Ctrl + Shift + K when surfing the website with the ad you want to block)
• Users can manually change which filters are being used:
Unfortunately AdBlock does not have an easy way to remove false positives like AdBlock Plus. Also, whereas AdBlock Plus fully stopped ads from being downloaded, because of the restrictions of Chrome, some ads are blocked by AdBlock after they have been downloaded as opposed to being blocked from being downloaded.


The plugin Safari Adblock to block all commercial content on websites. You can download this plugin for free.

You can just download the installer, install the plug-in, and then restart Safari. The webpages you visit will automatically be cleansed of flashy banners. Not of the all textual ads disappear

How to block advertisements in Firefox, Internet Explorer and Chrome

There are two types of advertisements • Good advertisements: those which are available only to people who actively want to see them and • Bad advertisements: those which are forced onto people’s computer monitors without permission. Advertisements can be very annoying (especially Flash ads) and, I feel everyone should at least have the knowledge of how to block ads. Also unwanted advertisements are widely considered to be intrusive and irritating, and can be a real nuisance if you have a slow internet connection

Using USB tethering, wireless hotspot or Bluetooth connection

USB tethering

USB tethering is the best if you are only connecting one device to your phone, and that device has a USB port. If you are connecting multiple devices, or connecting a tablet with no USB port, you will want to use a wireless hotspot.

->Connect your phone to your laptop via the USB cable. You can ignore any pop ups on your computer about browsing files.
->Open your Settings. Either press your Menu button and select Settings, or open the Settings app in the App Drawer.
->Under “Wireless and network”, click “Tethering and portable hotspot”.You may have to click “More Settings” in order to find this option. Different Android systems will be structured in different ways, but the general steps are the same.
-> Check the “USB tethering” box. This will begin sending network data to your laptop. A blue connection icon will appear in your phone’s notification bar. If you are running Windows XP, you will need to download the “tetherxp.inf” file from the Android website. The file will need to be installed when you connect your phone to your computer for the first time.
-> Uncheck the box to stop sharing. You can also disconnect the USB cable to stop sharing.

Create a wireless hotspot

If you need to connect more than one device to your phone’s data plan, you will want to create a wireless hotspot. Be aware that this is less secure than using USB tethering. Also you must be aware that anyone with the password can connect and start using your data.

-> Open your Settings. Either press your Menu button and select Settings, or open the Settings app in the App Drawer.
-> Under “Wireless and network”, click “Tethering and portable hotspot”.You may have to click “More Settings” in order to find this option. Different Android systems will be structured in different ways, but the general steps are the same.
-> Check the box labeled “Portable Wi-Fi hotspot”. Depending on your device, this may be a slider labeled “Mobile Hotspot” or something similar. Slide it to turn it on. Once the device is broadcasting, a blue wireless icon will be added to your phone’s notification bar.
-> Tap the “Portable Wi-Fi hotspot settings” button to configure the name of your wireless network, as well as the security. It is highly recommended that you secure your network to keep unwanted users from accessing the network and draining your data plan.

Bluetooth connection

1)Set up your cellphone's Bluetooth connection so the phone is recognized by your laptop. Enabling your phone's Bluetooth setting allows the phone to send a Bluetooth signal to your laptop long enough for the computer to recognize the signal and find the cellphone.
2) Click "Start," then click "Control Panel."
3) Click on "Printers and Other Hardware," then click "Bluetooth Devices."
4) Click on "Add," then follow the instructions your PC provides.
5) Choose PAN (Personal Area Network).
6) If prompted for a PIN code, try 0000 or 1234 and enter it on both the mobile device when prompted and your computer.

Macbook laptop
1) Set up your cellphone's Bluetooth connection
2) Open the "Applications" folder, click on "Utilities," then click on "Bluetooth Setup Assistant."
3) Choose the "Mobile Phone" device option.
4) Follow the prompts on your laptop and complete the pairing/tethering procedure.


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