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.
Have you forgot your NetGear, D-Link, Asus, Belkin, TP-Link, and Cisco Linksys routerâs username and password? Weâve all been there, if you canât remember what is the default password, there are two ways to gain access to the router admin interface, the first method involves resetting the password to factory settings, which will wipe out all the settings thus making your wifi unusable.