"Computers" are best described as "sub-accounts" for each one of your computers. The rule of thumb here is that each computer requires a different "computer" profile. You will have trouble pulsing if you use the same computer-profile on multiple physical computers.
If you have a regular PC and a laptop that you use, you need to create 2 computer-profiles. One can be called 'Home-PC' and the other 'Laptop'. When installing WhatPulse on your computers, you will need to enter the corresponding computer-profiles to each computer.