If you can use something, it's useful. Useful things are handy for whatever you're doing. If something is just what you need or you just find it helpful, then it's useful. A hammer is useful in building many things. Coasters are useful if you don't want a coffee table to get stains. College degrees are useful â or necessary â for many careers.
Where is the security key on a comcast modem located? The security key on a Comcast Modem is located next to the serial  number of the unit. Sometimes the serial number is the number used  as a security code if it is not printeâ¦d on the device. (MORE) 1 person found this useful.
Ad. 2. Enter your router's username and password. Every router will require a username and password before you can access the innards. If you never changed this when you first configured the router, chances are the username is admin and the password is admin or password.hange the password. Look for the box labeled Password, Passphrase or Shared Key. You can enter your new password into this box. Some routers will ask that you type the password again to ensure that you entered it correctly. 1  Try to create a strong password that would be difficult if not impossible to guess.