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.
How to Login to Comcast. 1  Go to Comcast account login page www.login.comcast.net and simply log in by putting in your username and password. 2  At this stage, you might be required to complete a Captcha, to prove that youâre human. Once you do that simply click on the âSign Inâ tab and you will be taken to your account page.