1. change email address for login

    Answer by i drink bcuz u dont luv me
    Sorry. Once you have registered your account you cannot change your Yahoo ID or email address.

    “Can I change my Yahoo! ID or email address?”
    http://help.yahoo.com/kb/index?page=content&id=SLN2059&actp=search&viewlocale=en_US&searchid=1367601105077&locale=en_US&y=PROD_MAIL_ML

    You can create a new account with a new Yahoo ID at the following link:

    https://edit.yahoo.com/registration?.src=fpctx&.intl=us&.done=http%3A%2F%2Fwww.yahoo.com%2F

    Create an extra email address:

    1. Sign in to Yahoo! Mail: http://mail.yahoo.com
    2. Move your mouse over the Gear Icon, and select “Mail Options”

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    3. On the left, select “Mail Accounts”
    4. Under the “Additional Email Address” section, click “Create an extra email address”
    5. Type the email address you want, and then click “Check Availability” (or select an email address from the available list)
    6. Once you have an available address click “Choose”
    7. Enter a verification captcha code
    8. Click OK.
    9. Click Go to Inbox.

    “Creating an extra Yahoo! email address”
    http://help.yahoo.com/kb/index?locale=en_US&y=PROD&page=content&id=SLN3290

    Or you can create an alias:

    “Aliases are an extention of a Yahoo Account which are intended to mask the accounts primary Yahoo ID. Generally, an accounts primary Yahoo ID serves as the main prefix for the Yahoo Mail account it is associated with. If a primary Yahoo ID is used to communicate via a product, it can expose the Yahoo Mail address associated with it.

    Please note that an alias is not an email address. Therefore, it is not possible to send and receive emails using your alias. By setting up and using an alias on your Yahoo Account, you will keep your Yahoo Mail address private and reduce the odds of being targeted by spammers.

    To set up an alias for your account:

    1. Go to your Yahoo Account Information page: http://account.yahoo.com
    2. Under “Account Settings”
    – Click “Manage your Yahoo aliases”
    3. Click “Add an alias”
    4. Create your new alias and click Save to the right.
    5. Click Close to return to the Account Information page.

    Note: While you are able to add/set up to 6 aliases for each Yahoo Account, you may still need to sign in with your primary Yahoo ID when accessing some parts of Yahoo. Note, also, that you do not have a separate password for your alias.”

    “What is an Alias?”
    http://help.yahoo.com/kb/index?locale=en_US&y=PROD&page=content&id=SLN3240

  2. what is address based authentication???

    Answer by Arie
    Address-based authentication is an authentication method based on the MAC address of a network card. If the MAC address of a network card is not found in the database of allowed MAC addresses, the client is refused to connect. Security based on MAC addresses alone is very weak, as MAC addresses can be easily spoofed. You would need to combine address-based authentication with port security to make sure that a stolen MAC address cannot be used from anywhere in the building and you would need to use usernames and passwords to verify the employee who uses an authenticated client. This combination provides a much greater security of your network. The only risk in this situation would be someone who would spoof the MAC address of a certain computer in a certain room and who would then use the network connection of this specific computer for his own laptop for example on which this person uses the stolen MAC address to connect to the network. This person would still require a username and password, but would already be able to monitor the network for plain text usernames and passwords for example. A proper intrusion detection system such as Snort is required to stop these attempts. More and more companies set up honey pots on their network, to catch evildoers. Remember that the outside world is not the biggest threat, but your employees are.

  3. Can expert tell me the advantage of register indirect addressing over direct addressing?

    Answer by mikos
    direct addressing (which means specifying the effective address within the assembly instruction) is pretty limited – it means that you have to know the absolute address when you write the code, which is at most times impractical since programs and their data are loaded into a different addresses in memory each time they are loaded.

    indirect addressing (which means that the effective address is stored in a register and the assembly instruction points to that register) is much more useful – for example when a subroutine is called, the caller may store the return address in a register, and when the subroutine finishes, it jumps to that return address using indirect addressing.